. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students . Fig. 161. Fig. 162. Fig. 161. Thermostat with 162. Powers Thennostat. Johnson Thermostat.—The valves in this thermostat areoperated by the expansion and contraction of a U-shaped metalstrip, consisting of two thin pieces, one of steel and one of brass,soldered together. The principle upon which this thermostat acts may be shownby reference to Fig. 160, which represents the mechanism withthe outer casing removed. The thermostat is mounted upon thewall of the room and i
. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students . Fig. 161. Fig. 162. Fig. 161. Thermostat with 162. Powers Thennostat. Johnson Thermostat.—The valves in this thermostat areoperated by the expansion and contraction of a U-shaped metalstrip, consisting of two thin pieces, one of steel and one of brass,soldered together. The principle upon which this thermostat acts may be shownby reference to Fig. 160, which represents the mechanism withthe outer casing removed. The thermostat is mounted upon thewall of the room and is connected with two small pipes (notshown in the cut), one leading to the air reservoir and the other SPECIAL DEVICES 239 to the steam valve or diaphragm to be operated. E is the metalstrip already mentioned, and as it expands or contracts, due tochanges in the temperature of the surrounding air, it actuatesthe small valve D at the top of the thermostat. When the tem-perature reaches a certain maximum point for which the ther-mostat is set, the valve D is thrown over so that a communicationis made between t
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