Nansen bottle
Nansen bottle a device used by oceanographers to obtain subsurface samples of sea water the bottle is loweredorbit the length of the nodical month averages 27.21222 Mean solar days also called dracontic month.By wire, its valves are open at both ends it is then closed 'in situ' by allowing a weight called a messenger to slide down the wire and strike the reversing mechanism this causes the bottle to turn upside down, closing the valves and reversing the reversing thermometers which are mounted in a special thermometer case on it if, as is usually done, a series of bottles is lowered, then the reversal of each bottle releases another messenger to actuate the bottle beneath
Source: http://www.iho.int/iho_pubs/standard/S-32/S-32-eng.pdf
Web site to visit: http://www.iho.int/
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