. The Philosophical magazine; a journal of theoretical, experimental and applied physics . N^n QF J. M^ has collected to overflow, it is immediately raised by thecompressed air into A, the sum of the lengths of the littlecolumns such as IS, T, &c. being less than the length of thecolumn R D. As the water used in compressing the air is in no wayinjured by the process, it may fill a tank and be used forany purpose. The elevator will of course raise many other liquids besidesmercury. If water is used instead of air, the mercury is alsoraised but wetted in the process. Water may be used whenfluids
. The Philosophical magazine; a journal of theoretical, experimental and applied physics . N^n QF J. M^ has collected to overflow, it is immediately raised by thecompressed air into A, the sum of the lengths of the littlecolumns such as IS, T, &c. being less than the length of thecolumn R D. As the water used in compressing the air is in no wayinjured by the process, it may fill a tank and be used forany purpose. The elevator will of course raise many other liquids besidesmercury. If water is used instead of air, the mercury is alsoraised but wetted in the process. Water may be used whenfluids which do not mix with it are to be dealt with. In the diagram the supports which carry the tubes, &c.,have been left out for the sake of clearness. In the instru-ment, which has been at work for the last two years in theMillard Laboratory, the height of the tube M N is abouteight feet, and the pressure of water at L 36 lb. per square Action of IJydrocJdoric-Acid Gas Oi Iceland Sjxir. 117 inch. After the elevator has been started the supply ofwater may be reduced till just sufficient to
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