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In the course of my examination of the "Challenger" thermometers, I was once surprised by a sudden bell-like vibration of the massive iron cylinder (nine inches thick) in which the apparatus to be tested was enclosed. This was due to the giving way of the protecting-sheath of one of the thermometers, at a pressure of a little over four tons weight on the square inch. When the pressure was let off, the bulb of the thermometer was found to have been crashed to an almost impalpable powder. I thendoi:10.1017/s0370164600047192 fatcat:bkttslusxrampdvfu5mjuo4z6y