. The Ontario high school physics. inds practical application also in theconstruction of thermostats. Thermostats are used mainly for controlling the temperaturein buildings heated by hot-air furnaces or boilers. In mostsystems of control, dampersor steam valves are openedand closed by electricity orcompressed air. The objectof the thermostat is to setfree the current of elec-tricity or the compressedair to close the valves ordampers when the tempera-ture reaches a certain 262 shows an electricthermostat and Fig. 263shows a pneumatic thermostat. Theessential part of each is the same
. The Ontario high school physics. inds practical application also in theconstruction of thermostats. Thermostats are used mainly for controlling the temperaturein buildings heated by hot-air furnaces or boilers. In mostsystems of control, dampersor steam valves are openedand closed by electricity orcompressed air. The objectof the thermostat is to setfree the current of elec-tricity or the compressedair to close the valves ordampers when the tempera-ture reaches a certain 262 shows an electricthermostat and Fig. 263shows a pneumatic thermostat. Theessential part of each is the same,the compound bar b. On the electricthermostat, the bending of the bar byheat closes the electiic current at the pneumatic thermostat, the bend-ing of the bar closes a small aperture ata through which the compressed airescapes slowly by a by-pass. The air thus held back enterstlie bellows c, which on expanding opens a valve and thisallows tlie main current of compressed air to have accessto the regulators in the furnace —Anelectrie thermostat.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
