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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
Fig. 166. General System of Wiring a House for Electric Heating. placed in the rooms to be regulated; and third, special diaphragm orpneumatic valves at the radiator-. The air-compressor is usually operated by water-pressure insmall plants and by steam in larger ones; electricity is used in somecases. Fig. K>7 shows a form of water compressor. It is similarin principle to a direct-acting steam pump, in which water underpressure takes the place of steam. A piston in the upper cylindercompresses the air, which is stored in a reservoir provided for thepurpose. When the pressure in the reservoir drops below a certain 199 190 HEATING VXD VF.XTILATH IN point, the compressor is started automatically, and continues tooperate until the pressure is brought up to its working standard. A thermostat is simply a mechanism for opening and closingone or more small valves, and is actuated by changes in the tempera- fi
Text Appearing After Image:
Fig. 167. Air-Compressor Operated by Wa-ter-Pressure, Automatically Controlled,ami Operating t Regulate Temperatureby Controlling Radiator Valves. Pig. 168. Thermostat Controlling Valveson Radiators, and Operating through Ex-pansion or Contraction of Metal Strip E. ture of the air in which it is placed. Fig. 168 shows a thermostatin which the valves are operated by the expansion and contractionof the metal strip E. The degree of temperature at which it actsmay be adjusted by throwing the pointer at the bottom one. way orthe other. Fig. 169 shows the same thermostat wTith its ornamental 200 HEATING AND VENTILATION 191 casing in place. The thermostat shown in Fig. 170 operates ona somewhat different principle. It consists of a vessel separated intotwo chambers by a metal diaphragm.One of these chambers is partiallyfilled with a liquid which will boilat a temperature beiow that desiredin the room. The vapor of theliquid produces considerable pres-sure at the normal temperature of

Note About Images