. 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. 19.—A common type of regulating device with the parts properly connected of the thermostat. As the heat expands the thermostat, the latter, if it is properly connected, pulls down on the connecting rod that is fastened to the regulator bar by the thumb screw, raising the disc that is hooked to the end of the regulator bar over the heater and th
. 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. 19.—A common type of regulating device with the parts properly connected of the thermostat. As the heat expands the thermostat, the latter, if it is properly connected, pulls down on the connecting rod that is fastened to the regulator bar by the thumb screw, raising the disc that is hooked to the end of the regulator bar over the heater and thus allowing the surplus heat to es- cape. As the heat is lowered the ther- mostat contracts, allowing the disc to drop down on the heater. The ther- mostat is usually in place when the in- cubator comes from the factory, but if found loose or detached little difficulty should be found in screwing it in place. There are several styles of thermostats now on the market, as seen in Fig. 20. This illustration shows (i) the six-bar type; (2) the double-disc; (3) the single-disc; (4) the three-bar type. The style most commonly used is composed of three metal bars, usu- ally a bar of steel be- tween two bars of zinc. These bars are riveted together at both ends and expand in the center when heated; therefore the connecting rod is passed through the bars at this point and fastened to the Fig. 20.—Several styles of thermostats. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State College of Agriculture; Cornell University. Agricultural Experiment Station. [Ithaca, N. Y. ?]
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