Talk:Diving weighting system

472:, and particularly for adding the references. I see that you have been editing Knowledge for a long time, so could I ask you to please use the usual methods and formats for citations. Also, the article subject is Diving weighting systems, not toxicity of heavy metals. I accept that lead toxicity in swimming pools and the environment is peripherally within the scope of the subject, but details about lead poisoning and acceptable exposure limits, in my opinion, are not, there is an adequate link to the appropriate article on lead poisoning. Nor in my opinion, does the reasonable scope of the subject include the hazards to amateur weight casters of lead fumes, as the article is not about casting lead. It seems to me that you differ on this point, so I would like you to explain your view, so I can understand it. Then there is the matter of alternative materials which are proposed, but as far as I know, with the exception of iron/steel, and occasionally brass or other copper alloys, are not actually used for diving weights. Do you have any evidence that anyone actually uses tungsten dive weights, or has used them, or is seriously proposing their use? Cheers, • • • 725:" Lead shot weights are clearly identified to readily shed large visible gray clouds of lead particulate into the water around them after being in dry storage. So this only occurs in storage? No, the abrasion is likely continuous while diving and you are moving in the water as the bags shift on your body, but the lead cloud is continually being flushed away in a trail behind the diver, and so it is not seen. How many hundreds to thousands of sea creatures in popular reef and tropical dive destinations are potentially being poisoned by the cloud trail of lead left behind by divers? It's insane." 714:: I am currently considering taking up SCUBA diving myself, but if possible I want to avoid all this and use stainless steel weights. They are impossible to find. After spending hours and hours searching the web, Amazon, and other sources, at this time, I conclude that there are no retail sources for any dive weighting material other than lead, so the issues of lead and its toxicity are very much on topic as no other option is commercially available. The only other alternative to minimize the environmental contamination risks appears to be the fully plastic-molded solid lead weights." 84: 1489:

between 500 and 2000 years to completely corrode away. Abrasion would speed this up, and overgrowth by fouling organisms or burial in sediments might slow it down. Yes, I have seen lead weights coated with encrusting coralline algae, but I don't have a reliable reference. Another reference indicates that lead corrodes about 4 times faster in seawater than in fresh water. This suggests that the properties of swimming pool water and/or composition of the weights may have a critical influence on corrosion rate. Cheers, • • •

822:" I realize the thoroughly analyzed and carefully discussed document about lead weights left in the child's wading pool is very damaging to the generally held belief of the so-called safety of lead dive weights used in swimming pools. If lead is so non-reactive as is claimed, then lead diving weights left sitting in a pool for years should not be a problem, yet these weights poisoned that kid's pool water to over 6000 times the FDA limit on lead in drinking water after just a few weeks. That is insanely high." 737:: In homes with lead paint, people are extremely worried that their child could merely swallow a few chips of paint (which contain tiny amounts of lead) and potentially get poisoned, yet divers are routinely releasing widely dispersing clouds of lead particulate from lead shot weights. How can this be justified as safe and appropriate? The only current justification for using lead is that it is cheap, or free if you cast your own." 74: 53: 719:

seen mild steel used as weights, and cast iron, but not often, and usually for special purposes where large weights are needed, like on diving bells, though once or twice I have seen divers using them for personal dive weights. I have no references. Unfortunately I probably live in a different country to you so I can't help you with suggestions for alternative commercially available weight systems.

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is not mentioned, nor was an assay reported of the specific composition of those weights. I know from personal experience that lead weights left in the sea or fresh water are usually not much corroded after longer periods of months to several years. It is not good science to generalise too much from a single case, particularly where much of the relevant data is not available.

22: 386: 358: 338: 314: 294: 274: 697:": Use of steel, bismuth, and tungsten has been discussed as alternatives by divers on various Internet forums. Just do a web search for bismuth or tungsten dive weights and you will find them immediately. Bismuth is already being used as a substitute in both ammunition and fishing in the states where lead has been banned. Random web examples:" 567:, Speaking of my edit history on Knowledge, I have similar questions about your own edit history and background, and your interest in this article. What precisely does "PB" mean in your username? To me I believe it indicates the scientific symbol for the element lead, and you are a diver yourself so clearly this is a topic of interest to you. 1559: 811:" I think it is only a matter of time before attention is focused on other forms of recreation and industry that use lead merely for ballast, such as free diving and SCUBA diving, and these too will likely be subject to similar bans and use of ballast alternatives to reduce environmental contamination sources." 666:"None of this is "peripheral". At this time, virtually all weights used anywhere are made out of lead, and lead has been clearly identified as a persisting toxin for wildlife and humans, so the issue of divers potentially spreading heavy metal contamination from their dive equipment is definitely topical here." 202:

to produce negative bouyancy at a particular depth with no air vest at all. I'm afraid I know next to nothing about SCUBA and nothing like experienced enough in freediving to get stuck in to this article without fear of messing things up. I'll help where I can if someone else can take a lead in editing though.

966:

This may happen. (though I doubt it). When it does, it will probably make the headlines somewhere and will then be citable. At that time it can be added to the article. Until then it seems that we have only hypothesis, which is not citable unless published somewhere more reliable than a blog site.• •

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You appear to misinterpret my comments. I have not proposed removing the toxicity discussion, I proposed giving it due weight and relevance to the subject matter. I have no objection to any material that is within the reasonable scope of the article as indicated by the title. I also have no objection

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I have looked at the websites, They show that non-lead substitutes are used for bullets and fishing weights. No mention is made of diving weights. Divers discussing alternative materials on an internet forum is evidence that divers discuss alternative weight materials, not that they have been used in

1414:

I made no claims regarding belief that lead diving weights are safe in swimming pools, and have not claimed any particular belief regarding severity of lead contamination hazard in swimming pools in general. I remain unpersuaded either way due to lack of evidence regarding the full range of swimming

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Lead cloud shedding after dry storage is a well known effect, but I expect no one has actually done any motion studies of lead shot in active use. I will look around. But since lead blocks radiation, it can probably be directly visualized with a clear-walled hydrodynamic flume tank of flowing water,

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And User:Pbsouthwood, Speaking of my edit history on Knowledge, I have similar questions about your own edit history and background, and your interest in this article. What precisely does "PB" mean in your username? To me I believe it indicates the scientific symbol for the element lead, and you are

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I am not surprised they are impossible to find, as they would be very much more expensive than lead. I have also never seen them, therefore it is not unreasonable to assume they may not exist, and are thus not really suitable for inclusion in the article, as it is primarily about real things. I have

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I think it is only a matter of time before attention is focused on other forms of recreation and industry that use lead merely for ballast, such as free diving and SCUBA diving, and these too will likely be subject to similar bans and use of ballast alternatives to reduce environmental contamination

534:

In homes with lead paint, people are extremely worried that their child could merely swallow a few chips of paint (which contain tiny amounts of lead) and potentially get poisoned, yet divers are routinely releasing widely dispersing clouds of lead particulate from lead shot weights. How can this be

826:

On the face of it that appears to be so in this particular case. However, a large amount of relevant data is not included in the report, and I do not consider that the conclusions reached for that particular case are necessarily relevant for all uses of lead weights. For example, the pH of the pool

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As and when such attention is focused, and reliable references become available, the article may be altered to reflect these changes, within the scope of the subject defined by the title. So far, this has not been shown to be the case. You are free to try do do so as long as you follow the terms of

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Thank you for your kind words. It is not the quality of your references I would like improved, just the formatting of the citation. I may be able to find better ones if I an convinced that it is worth the effort, but as a general principle, if someone wants to put some content on Knowledge which is

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Even if you can provide reliable sources that this is a common activity , it may remain out of scope as the article is not about the manufacture of lead weights it is about the use of diving weights, which happen to be made from lead. I am open to logical persuasion, but please keep the suggestions

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I realize the thoroughly analyzed and carefully discussed document about lead weights left in the child's wading pool is very damaging to the generally held belief of the so-called safety of lead dive weights used in swimming pools. If lead is so non-reactive as is claimed, then lead diving weights

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I am currently considering taking up SCUBA diving myself, but if possible I want to avoid all this and use stainless steel weights. They are impossible to find. After spending hours and hours searching the web, Amazon, and other sources, at this time, I conclude that there are no retail sources for

502:

Use of steel, bismuth, and tungsten has been discussed as alternatives by divers on various Internet forums. Just do a web search for bismuth or tungsten dive weights and you will find them immediately. Bismuth is already being used as a substitute in both ammunition and fishing in the states where

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Diving weights are used by freedivers too. The article, and especially the introduction would be far better if it wasn't so SCUBA-centric. For example, the intro currently suggests weight belts are used to make a diver negatively bouyant and counteracted with air, when in fact freedivers use weight

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As you say, it is your opinion. Not much I can do about that. However you are mistaken. Since I have the personal knowledge of my own motivations, I can say that with confidence. Whether you believe it is not a thing I can fix. You are free to be wrong and hold that opinion. My actual agenda is to

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body, but the lead cloud is continually being flushed away in a trail behind the diver, and so it is not seen. How many hundreds to thousands of sea creatures in popular reef and tropical dive destinations are potentially being poisoned by the cloud trail of lead left behind by divers? It's insane.

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Lead shot weights are clearly identified to readily shed large visible gray clouds of lead particulate into the water around them after being in dry storage. So this only occurs in storage? No, the abrasion is likely continuous while diving and you are moving in the water as the bags shift on your

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I made no such claim, I pointed out that your references support only a limited claim of significant hazard, and only in swimming pools, and not necessarily in all swimming pools. If you wish to make assertions of more extensive hazard this should be supported by evidence directly supporting such

766:

Ask away, If your questions are civil and reasonable I will probably answer them in the same spirit. PB are my initials. You may have noticed that my signature gives my first name. The fact that lead has been allocated the same pair of letters is a coincidence which I do not think my parents were

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None of this is "peripheral". At this time, virtually all weights used anywhere are made out of lead, and lead has been clearly identified as a persisting toxin for wildlife and humans, so the issue of divers potentially spreading heavy metal contamination from their dive equipment is definitely

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A quick search for rates of corrosion of lead in seawater came up with 0.2 to 0.5 Mils (Mil= 1/1000 inch) per year (0.05 to 0.127mm per year if you prefer) for Pure lead, Antimonial lead and Tellurium lead alloys (no significant diffrences between them) At this rate a block 1" thick would take

882:

Lead paint in homes, paint chip hazards. Since this is a talk page, I will not do inline citations. I bet you have heard of this thing called Google, it is useful for answering such questions yourself rather than whining and complaining that I don't cite every sentence I write. If you want more

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Before the 1970s, household paint often contained lead. As lead paint ages, it can chip or crumble into dust. Exposure to lead-paint dust or chips can cause serious health problems. Children and pregnant women are at higher risk. So, if you live in or own an older home, you need to know how to

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I suppose there should be a second consideration for divers in trouble: don't drop your weights or you will leave behind a persistent toxin source in the marine environment that will persist until the entire mass has completely dissolved and pollution hundreds of cubic meters of water and

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to you creating an article with a different scope providing it falls within the criteria for a Knowledge article. I will however, probably oppose changing the scope of this article away from the purpose, function and use of diving weighting systems to concentrate on heavy metal toxicity.

833:"So if your agenda is to bury these toxicity and environmental hazards, then it is clearly in your best interest to minimize that paragraph and cite, cut it down and remove the citation notes like you did, and maybe even suppress or remove it if you can find a good enough justification." 523:

any dive weighting material other than lead, so the issues of lead and its toxicity are very much on topic as no other option is commercially available. The only other alternative to minimize the environmental contamination risks appears to be the fully plastic-molded solid lead weights.

687:" Regarding the discussion of alternatives, lead has already been banned by states and countries for use in other recreational activities such as bullets for game hunting and target shooting. Lead weights for fishing lures have also been banned in some states for similar reasons." 753:

If this is a significant source of lead pollution I will agree with you. So far I have not seen convincing evidence. I know a large number of diving scientists, ecologists, biologists, environmentalists included, and none of them have mentioned diving weights as an environmental

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So if your agenda is to bury these toxicity and environmental hazards, then it is clearly in your best interest to minimize that paragraph and cite, cut it down and remove the citation notes like you did, and maybe even suppress or remove it if you can find a good enough

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Regarding the discussion of alternatives, lead has already been banned by states and countries for use in other recreational activities such as bullets for game hunting and target shooting. Lead weights for fishing lures have also been banned in some states for similar

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There are not many inline references, but the material is pretty basic and uncontroversial. I can look up references if there is anything that a reviewer feels should be referenced. Please use inline "citation needed" templates to indicate exactly what you feel needs

1361:

If lead weights are either no hazard or an insignificant hazard to swimming pools, then prove it. Where are your citations? Simply pooh-poohing my own very damning cite with your questions about pH and so forth is again trying to whitewash and minimize the issue.

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If bare uncoated lead diving weights are so safe in swimming pools as you believe, then provide thoroughly documented citations by experts to back your own claim, and be sure it covers pH and similar accessory details like you now demand of the cite I provided.

799:" But I am of the opinion you probably have an agenda to protect your sport's / hobby's image and whitewash these health and safety issues that I am raising out of this article, and sweep them away where they cannot be noticed or be easily found on the web. 585:

But I am of the opinion you probably have an agenda to protect your sport's / hobby's image and whitewash these health and safety issues that I am raising out of this article, and sweep them away where they cannot be noticed or be easily found on the

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aware of at the time they named me. As an engineer, all engineering materials are interesting to me, lead is no exception, and as a diver and a diving instructor, the materials and equipment used in diving are of interest to me. This is not unusual.

962:

I expect diving weights are no more a significant pollution vector than the tiny lead sinkers for fishing and which sometimes get lost or swallowed by organisms. And yet lead have been banned for fishing anyway. The prospects do not look good.

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I have not seen this myself, do you have a reliable reference? Are there studies showing this to be a problem? Particularly that this is a significant source of lead pollution. I do not know, I remain neutral on this point due to lack of

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pools. I accept the findings of CDC that some lead weights in some swimming pools produce highly elevated lead concentrations, but this is not conclusive evidence about pools of other kinds or all diving weights.• • •

741:

Again, do you have a reliable reference that this is a problem? It may well be, but I have no evidence. We are not permitted to speculate or hypothesize and pass it off as fact. That is not considered encyclopaedic.

606:

left sitting in a pool for years should not be a problem, yet these weights poisoned that kid's pool water to over 6000 times the FDA limit on lead in drinking water after just a few weeks. That is insanely high.

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Can you produce reliable sources to support this argument? Specifically that diving weights are a significant pollution vector. If so I accept your argument, if not, it is original research and inadmissible.

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Please provide reliable sources of testing procedures performed on lead shot and solid lead weights to verify that they pose no toxicity risks for other swimmers in either open water or in swimming pools.

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I think it is irresponsible for recreational and professional divers, who are also frequently environmentalists and conservationists, to be so cavalier about poisoning the waters where they dive.

540:

I think it is irresponsible for recreational and professional divers, who are also frequently environmentalists and conservationists, to be so cavalier about poisoning the waters where they dive.

883:

scholarly answers, try Google Scholar. But I think you are just being obstinate. To get you started, try this one: New York State, What Home Owners Need to Know About Removing Lead-Based Paint

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a large fluorescent screen on one side, and a broad beam low energy X-ray source on the other. (If any environmental pollution researcher reading this wants to take this on, be my guest.)

1326:

No, I am mainly stating that some of your claims are not sufficiently relevant to the article subject to justify inclusion. This does not need citation, it is following Knowledge policy.

805:

help create a good, balanced neutral article on the subject of the article title. I make no money out of diving, though I do spend a lot of time and money on it and associated matters.

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Bardy, Erik; Mollendorf, Joseph; Pendergast, David (October 21, 2005). "Thermal conductivity and compressive strain of foam neoprene insulation under hydrostatic pressure".

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Bardy, Erik; Mollendorf, Joseph; Pendergast, David (21 October 2005). "Thermal conductivity and compressive strain of foam neoprene insulation under hydrostatic pressure".

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I apologize if any of the above are effectively identical; I am just a simple computer program, so I can't determine whether minor differences are significant or not.

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Lead paint is not used in diving weights (to the best of my knowledge) therefore the toxicity of lead paint is not relevant to an article about diving weights. • • •

1964: 1784: 1780: 1766: 1674: 1670: 1656: 773:"You seem like a smart person, so if you don't like the "quality" of my cites for lead poisoning, I bet you could do just as well finding better ones yourself." 576:

You seem like a smart person, so if you don't like the "quality" of my cites for lead poisoning, I bet you could do just as well finding better ones yourself.

1846: 676:"Lead casting is on-topic because casting your own lead weights is a common activity for divers trying to save a buck, by recycling lead from other sources." 1954: 491:

Lead casting is on-topic because casting your own lead weights is a common activity for divers trying to save a buck, by recycling lead from other sources.

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This talk page is a suitable place to discuss any content or proposed content for the article, so yes, I think lead toxicity is worth discussing here.

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Can you provide a citation that handwashing is sufficient to remove all lead particulate from your arms and hands after handling lead shot mesh bags?

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challenged, it is up to them to find a suitable reference. I have done this many times, and it seems that you have too. This is normal procedure.

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You are claiming that the toxicity and safety issues are minor and should be removed from this article. Provide evidence for your own claims.

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Language seems understandable without specialist knowledge. If there are any terms that need explanation, please mark with "clarify" template.

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When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

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Please provide citations that handling of lead weights, is completely harmless and that contamination of food or drink never occurs

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justified as safe and appropriate? The only current justification for using lead is that it is cheap, or free if you cast your own.

515: 846:" Or just remove the toxicity discussion completely and just don't discuss any of this at all, as you are now proposing here." 625:

Or just remove the toxicity discussion completely and just don't discuss any of this at all, as you are now proposing here.

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Please provide citations for your claims that lead diving weights are harmless to the environment and aquatic creatures.

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Knowledge is not a platform for advocating change, if that is what you wish to do. If not, please explain your point.

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article, so I am asking for a sentient editor to look it over and copy the correct ref content into this article.

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The article has a defined structure appropriate to the topic. Lead section is adequate and summarizes the article.

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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the

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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the

1857:'s orphans, the problem is that I found more than one version. I can't determine which (if any) is correct for 1239: 89: 1072:

Since we are playing the citation game, I can basically throw this right back at you and make similar demands.

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https://web.archive.org/web/20070621090205/http://ygraine.membrane.com:80/enterhtml/live/scuba/products.html

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Maybe if you were to explain what you are trying to achieve we could arrive at a solution. Cheers, • • •

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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with

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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with

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claims. I made no claims as to actual extent of hazard, therefore do not need to provide evidence.• • •

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https://web.archive.org/web/20080415175444/http://www.mares.com:80/lab_detail.php?id=73&region=ALL

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https://web.archive.org/web/20151005180109/http://www.hseni.gov.uk/l106_media_diving_projects.pdf

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The prose contains no major grammatical errors and flows sensibly, but it certainly need not be "

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before doing mass systematic removals. This message is updated dynamically through the template

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before doing mass systematic removals. This message is updated dynamically through the template

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The article reasonably covers the topic, and does not contain obvious omissions or inaccuracies.

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http://wdfw.wa.gov/conservation/loons/non-lead_fishing_tackle_suppliers_updated_may_2010.pdf

473: 445: 407: 249: 165: 1810: 1700: 1626: 288:, although some sections may need expansion, and some less important topics may be missing. 1516:"CORROSION OF MATERIALS IN SURFACE SEAWATER AFTER 12 AND 18 MONTHS OF EXPOSURE" 426:

The article complies with requirement 2, most aspects of the topic are covered adequately.

1756: 1889: 1932: 1769:, "External links modified" talk page sections are no longer generated or monitored by 1659:, "External links modified" talk page sections are no longer generated or monitored by 1923: 1897: 1809:

If you found an error with any archives or the URLs themselves, you can fix them with

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If you found an error with any archives or the URLs themselves, you can fix them with

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standard, and to comprehensively cover the topic with quality encyclopedic articles.

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It is written with as broad an audience in mind as possible. Although Knowledge is

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It may be well known, but is it well referenced as an environmental problem?• • •

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Your argument fails if your premise is unproven, and your premise is ungrounded.

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to try to fix reference errors. One of the things I do is look for content for

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and all the sections that can reasonably be included in an article of its kind.

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etc. should be included where they are relevant and useful to the content.

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Content should be organized into groups of related material, including a

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I will look at your examples before commenting further on this point.

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Illustrations are encouraged, though not required. Diagrams and an

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within the accepted conventions for content of Knowledge articles.

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a diver yourself so clearly this is a topic of interest to you."

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Prose is clear and grammatical, without obvious spelling errors.

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It contains a large proportion of the material necessary for an

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I doubt it, but you are free to speculate on a talk page.• • •

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I will try ro work my way through your comments systematically.

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http://ygraine.membrane.com/enterhtml/live/scuba/products.html

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use of Knowledge and the accepted procedures of the community.

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I must break here due to a small emergency, Back later. • • •

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When you have finished reviewing my changes, please set the

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The article contains supporting materials where appropriate.

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for additional information. I made the following changes:

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for additional information. I made the following changes:

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Hi DMahalko, Thanks for helping to expand the content on

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in wikilinked articles. I have found content for some of

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http://www.mares.com/lab_detail.php?id=73&region=ALL

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Illustrations and diagrams are adequate for the purpose.

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http://www.hseni.gov.uk/l106_media_diving_projects.pdf

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after any such claims in the article. Cheers, • • •

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Please take a moment to review 384: 368:appropriately understandable way 356: 336: 332:need not be followed rigorously. 312: 292: 272: 82: 72: 51: 20: 137:This article has been rated as 1833:15:25, 11 September 2017 (UTC) 1: 1723:04:57, 14 December 2016 (UTC) 1497:16:06, 28 February 2016 (UTC) 1469:06:56, 28 February 2016 (UTC) 1423:14:39, 28 February 2016 (UTC) 1374:14:39, 28 February 2016 (UTC) 1291:05:36, 28 February 2016 (UTC) 1253:05:21, 28 February 2016 (UTC) 1207:00:21, 28 February 2016 (UTC) 1048:23:50, 27 February 2016 (UTC) 1011:05:21, 28 February 2016 (UTC) 975:05:21, 28 February 2016 (UTC) 938:05:21, 28 February 2016 (UTC) 902:05:21, 28 February 2016 (UTC) 862:23:57, 27 February 2016 (UTC) 789:21:43, 27 February 2016 (UTC) 705:practice to a notable extent. 644:19:58, 27 February 2016 (UTC) 555:19:42, 27 February 2016 (UTC) 480:19:30, 26 February 2016 (UTC) 444:Looks good for B-class • • • 99:WikiProject Underwater diving 1865:Reference named "Bardy2005": 1560:"Handbook of Corrosion Data" 890:protect yourself and others. 452:18:14, 1 December 2016 (UTC) 252:is cited. The use of either 1924:10.1088/0022-3727/38/20/009 1898:10.1088/0022-3727/38/20/009 1981: 1796:(last update: 5 June 2024) 1732:Hello fellow Wikipedians, 1686:(last update: 5 June 2024) 1592:Hello fellow Wikipedians, 414:09:06, 27 March 2013 (UTC) 355:. Adequately illustrated. 212:00:00, 6 August 2011 (UTC) 123:Underwater diving articles 191:18:04, 14 June 2007 (UTC) 177:17:52, 14 June 2007 (UTC) 136: 67: 46: 1941:14:30, 2 July 2020 (UTC) 1845:I check pages listed in 1543:: CS1 maint: location ( 271:Fairly well referenced. 96:This article is part of 90:Underwater diving portal 1855:Diving weighting system 1840:Diving weighting system 1838:Orphaned references in 1737:Diving weighting system 1728:External links modified 1597:Diving weighting system 1588:External links modified 470:Diving weighting system 250:likely to be challenged 106:-related articles to a 28:This article is rated 1562:. ASM International. 1777:regular verification 1667:regular verification 1235:By all means insert 1890:2005JPhD...38.3832B 1851:orphaned references 1767:After February 2018 1657:After February 2018 1636:parameter below to 793:OK, back to finish. 236:suitably referenced 1821:InternetArchiveBot 1772:InternetArchiveBot 1711:InternetArchiveBot 1662:InternetArchiveBot 463:User_talk:DMahalko 259:citation templates 217:Ready for B-class? 34:content assessment 1918:(20): 3832–3840. 1884:(20): 3832–3840. 1797: 1687: 1491:Peter (Southwood) 1417:Peter (Southwood) 1368:Peter (Southwood) 1285:Peter (Southwood) 1247:Peter (Southwood) 1005:Peter (Southwood) 969:Peter (Southwood) 932:Peter (Southwood) 896:Peter (Southwood) 856:Peter (Southwood) 783:Peter (Southwood) 474:Peter (Southwood) 446:Peter (Southwood) 408:Peter (Southwood) 396: 395: 157: 156: 153: 152: 149: 148: 114:Underwater diving 104:Underwater diving 59:Underwater diving 1972: 1938: 1927: 1901: 1831: 1822: 1795: 1794: 1773: 1721: 1712: 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