Identifier: cyclopediaofheat02ameruoft (find matches)
Title: Cyclopedia of heating, plumbing and sanitation; a complete reference work
Year: 1909 (1900s)
Authors: American School (Chicago, Ill.)
Subjects: Heating Plumbing Sanitation Ventilation
Publisher: Chicago American School of Correspondence
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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MM A Mt in. Pig. 170. Thermostat Operating through Expansion or Contraction of the Vaporof a Volatile Liquid. to the damper should be used. By this arrangement the damperis held in such a position at all times as to admit the proper proportionsof hot and cold or tempered air for producing the desired temperaturein the room with which it is connected. Large dampers which are to be operated pneumatically, shouldbe made up in sections or louvres. Dampers constructed in thismanner are handled much more easily than when made in a singlepiece. It often happens, in large plants, that there are valves anddampers in places which are not easily reached for hand manipula-tion. These may be provided with diaphragms and connected withthe air-pressure system for operation by hand-switches or cocks 202
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HEATING AND VENTILATION 195 conveniently located at some centra/ point in the basement or boilerroom. Telethermometer. This is a device for indicating on a dialat some central point the temperature of various rooms or ducts indifferent parts of a building. A special transmitter is placed in eachof the rooms and electrically connected with a central switchboard.Then, by means of suitable switcnes, any room may be thrown incircuit with the recorder, and the temperature existing in the roomat that time read from the dial.

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