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mechanism at the top allowing the bottle to freely rotate from the bottom, ending in both valves closing, trapping the water sample inside. The messenger weight further impacts the bottom clamp, releasing the messenger weight suspended below it to travel to the next bottle in line. After all of the bottles are tripped, they are then retrieved by hauling in the cable.
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at depth will compress the thermometer walls and affect the indicated temperature, the thermometer is protected by a rigid enclosure. A non-protected thermometer is paired with the protected one, and comparison of the two temperature readings allows both temperature and pressure at the sampling point
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When the final bottle has been attached and lowered, the bottles are held at depth until the thermometers stabilize at temperature. A messenger weight is then sent down the cable to start a cascading triggering of the bottles. When the weight reaches the first bottle, the impact releases the tripping
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rope. The action of the messenger weight is to trip both caps shut and seal the tube. A reversing thermometer may also be carried on a frame fixed to the Niskin bottle. Since there is no rotation of the bottle to fix the temperature measurement, the thermometer has a separate spring-loaded rotating
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The Nansen bottle (originally of brass metal) is designed for the capture of water deep in the ocean. It is essentially an open tube with a wide valve at each end connected together by a solid rod. A bottle is attached to the cable at its bottom using a clamping design and at its top by a tripping
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valves that may be either preset to trip at a specific depth detected by a pressure switch, or remotely controlled to do so via an electrical signal sent from the surface. This arrangement conveniently allows for a large number of Niskin bottles to be mounted together in a circular frame termed a
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in March 1966. Instead of a metal bottle sealed at one end, the 'bottle' is a tube, usually plastic to minimize contamination of the sample, and open to the water at both ends. Each end is equipped with a cap which is either spring-loaded or tensioned by an
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with a constriction in its capillary tube which, when the thermometer is inverted, causes the thread to break and trap the mercury, fixing the temperature reading. Since water
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A heavily-weighted cable is lowered from a ship and multiple bottles are attached at calculated intervals in order to place them at specific depths.
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204:. Lynne D. Talley, George L. Pickard, William J. Emery, James H. Swift (6th ed.). Amsterdam: Academic Press. 2011.
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temperature sensors are more commonly employed on Niskin bottle as they are more accurate than mercury thermometers.
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is a device for obtaining samples of water at a specific depth. It was designed in 1894 by
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mechanism. A messenger weight is suspended below the clamping design.
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The Niskin bottle is an improvement on the Nansen bottle patented by
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115:. As many as 36 bottles may be mounted on a single rosette.
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Descriptive physical oceanography : an introduction
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mechanism of its own tripped by the messenger weight.
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at the water sampling depth is recorded by means of a
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66:fixed to the Nansen bottle. This is a mercury
104:A modern variation of the Niskin bottle uses
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143:"Oceanographic instrumentation Lecture 13"
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175:Essential Invitation to Oceanography
141:Tomczak, Matthias (16 March 2000).
178:. Colgate University. p. 98.
87:Niskin bottle about to be deployed
16:Device for sampling water at depth
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251:Niskin Bottles Firing Underwater
43:Sailor holding a Nansen bottle
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276:Oceanographic instrumentation
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27:and further developed by
172:Pinet, Paul R. (2012).
232:: CS1 maint: others (
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64:reversing thermometer
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147:mt-oceanography.info
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155:. Retrieved
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93:Shale Niskin
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29:Shale Niskin
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68:thermometer
60:temperature
35:Description
260:Categories
123:References
117:Thermistor
228:cite book
220:720651296
31:in 1966.
106:actuated
72:pressure
58:The sea
266:Bottles
157:7 April
112:rosette
98:elastic
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234:link
216:OCLC
206:ISBN
180:ISBN
159:2018
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