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I am astonished that
Knowledge (XXG) has no article describing the history of the pneumatique, or pneumatic postal/ telegraph service in Europe. It was the "Express Mail" of its day. I can't write it because I don't know enough about the technical end without drawing heavily on this article:
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The article claims that hydraulics have a "higher energy density". When I think energy density, I think stored energy. I can store energy via pneumatics by compressing the gas. Since hydraulic fluid doesn't compress (appreciably), there is no energy storage.
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Since fluid doesn't compress, moving the load away from the fluid a small distance depressurizes the liquid. The hydraulic system therefore doesn't keep pushing on the load like a pneumatic system would.
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Also, I'm not quite sure what the previous author had in mind when he/she said "the slightest motion of the load releases the pressure". That doesn't make any sense to me.
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I was working in a piano rebuilding shop when several player pianos and reproducing pianos came in. Surely they represent the apotheosis of pneumatic engineering.
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To whoever is "managing" this page, may I suggest an external link to the "Heath
Robinson Rube Goldberg (HRRG) Mixed Technology Computer" project at
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on
Knowledge (XXG). If you would like to participate, please visit the project page, where you can join
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on
Knowledge (XXG). If you would like to participate, please visit the project page, where you can join
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and I don't want to make a
Knowledge (XXG) article that just looks like I transcribed a website. --
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I also put a bit more info to the
Advantages of Pneumatics section using info from class notes.
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Interesting, but a far stretch from being related to the topic of this article.
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I'm going to change "higher energy density" to "Fluid doesn't absorb energy".
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Just a vaguely-relevant picture of a type of locomotive from the 1920s.
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http://www.compulink.co.uk/~mhayhurst/jdhayhurst/pneumatic/book1.html
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article which looks very detailed, if someone wants to translate.
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Knowledge (XXG) level-5 vital articles in
Technology
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512:Knowledge (XXG) vital articles in Technology
366:I had a go at cleaning up the head section.
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