Mechanical equipment of buildings; a reference book for engineers and architects (1916)
Harding, Louis Allen, Willard, Arthur C. (Arthur Cutts), 1878-1960 · New York Wiley · leaf 487
pressurein E Ufts up the diaphragm, and the air from the branch escapes out through the hollow stemof the main valve. The thermostat thus operates on a reducing valve princijjle which insuresvarious pressm-es as required in the branch line to operate the damper. Air from the high pressure suppli… … Fig. 13. The National Intermediate or Graduated Type of Thermostat. The National Thermostat is of the expansion type, and is made for both positive (Fig 12)and graduated (Fig 13) service. The positive type of thermostat consists of the thermostatic tube A of vulcanized rubber,a change in the length…
Building · Heating · Ventilation
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-415-278.webp)
