ost of the material delivered in New York is about 65 cents | tube, B, and on the return it is compressed through the tube, mediums they employ for abstraction of heat, hence they | a pound. C. Tube B connects with the refrigerator, D; tube C with are distinctively known as air machines, ether… … maining fluid under a pressure of from 2 : circulation as already described. to 8 atmospheres. When allowed to es- THE PICTET ICE MACHINE. In the large illustration, Fig. 1, is re- cape in air it vaporizes rapidly, producing presented the arrangement of machine- a decrease of temperature of 185°…
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