. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Fig. 56.—Several styles of thermostats regulator, and this is used because it happens to be the one at hand. How- ever, the principles followed are very similar in all incubators. The thermostat. — The thermostat is a most important part of an incubator. The ability of an in- cubator to hatch eggs depends largely on the sensitiveness and the power o
. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Fig. 56.—Several styles of thermostats regulator, and this is used because it happens to be the one at hand. How- ever, the principles followed are very similar in all incubators. The thermostat. — The thermostat is a most important part of an incubator. The ability of an in- cubator to hatch eggs depends largely on the sensitiveness and the power of the thermostat. As the heat expands the thermostat, the latter, if it is properly connected, pulls down on the connect- ing rod that is fastened to the regulator bar by the thumbscrew, raising the disk that is hooked to the end of the regulator bar over the heater, and thus allowing the surplus heat to escape. As the amount of heat de- creases, the thermostat contracts, allowing the disk to drop down on the heater. The thermostat is usually in place when the incubator comes from the factory, but if it is found loose or detached, little difficulty should be found in screwing it into place. There are several styles of thermostats now on the market, as seen in Fig. 56. This illustration shows (i) the six-bar type, (2) the double-disk type, (3) the single-disk type, (4) the three-bar type. The style most com- monly used is composed of three metal bars, usually a bar of steel between two bars of zinc. These bars are riveted together at both ends and ex- pand in the center when heated; therefore the connecting rod is passed through the bars at this point and is fastened to the lowest bar (Fig. 56,4). The six-bar thermostat is merely two three-bar thermostats riveted to- gether (Fig. 56, i). Both these types are very satisfactory. The disk, or wafer, thermostats (Fig. 56, 2 and 3) are usually made of copper and are filled with a very sensitive fluid. They are very susceptible to
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