Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 658
To secure the most perfect results in temper-ature regulation the system of individual room control should be used. The thermostat and diaphragm valve (Fig. 6) are the essential elements of this system. Each room is supplied with a theromostat and each radiator is equipped with a diaphragm valve.A…
Building materials
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