Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 659
plan Elevation Fics. 9 and 10. THE POWERS SYSTEM OF HE.iT REGUL.VTION FOR SCHOOLS .\ND PUBLIC INSTITUTIONS HE.\TED BY THE F.-^N SYSTEM A is the thermostat which controls the compressed air generated at F and operating the diaphragmmotor B ; this being connected to the mixing dampers C, holds them…
Building materials
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