Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . ton amounts to 54 cents. Ammonia Machines differ entirely from those previously described, in which ether, etc., is used, inthat no pumps are used or other direct application of power is made to restore the gaseous mate-rial bo B liquid form by production of pressure. Either a saturated solution of ammonia or the lique-fied ammonia is used. The first are necessarily worked under a high pressure, in hot climates, withthe thermometer at 95°, the pressure reaches 300 lbs. per square inch,
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . ton amounts to 54 cents. Ammonia Machines differ entirely from those previously described, in which ether, etc., is used, inthat no pumps are used or other direct application of power is made to restore the gaseous mate-rial bo B liquid form by production of pressure. Either a saturated solution of ammonia or the lique-fied ammonia is used. The first are necessarily worked under a high pressure, in hot climates, withthe thermometer at 95°, the pressure reaches 300 lbs. per square inch, and it i* niver less thanfrom 180 to 225 lbs. In liquefied ammonia machines the pressure is from 135 to 180 ibs. The diffi-culties are chiefly the frequent ami heavy leaks, the corrosive action of the ammonia on metals, theimpossibility of using grease as a lubricant, and the deposits which form in the boilers. Vaas and Littmanns machint is represented in Fig. 2370. This consists of the boiler A, condenserB, gas-holder C, ice-box D, absorption-cylinder L\ temperature-exchanger F, cooler O, and pump The boiler A is first half filled with solution of ammonia, which is caused to evaporate by the applica-tion of heat, and the gas thus formed is forced through the pipe I into the worm-pipe of the conden-ser B, and thence through the pipe 2 into the gas-holder O. From the gas-holder the-gas is conductedby the pipe 3 to the valve on the top of the ice-box I), which is in connection with the worm-pipe in-side the ice-box. The gas on its passage through the worm-pipes of the condenser (which are alwayssurrounded by cold water) is condensed and the liquid passes through the valve to the worm-pipes in ICE-MAKING MACHINERY 139 the ice-box, where it again begins to evaporate, taking up at the same time heat from the solution ofchloride of calcium, in which the worm-pipes in the ice-box are submerged. This absorption of heatso lowers the temperature of the solution of chloride of calci
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