Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 250
Fig. 171. Exterior View, and Section Showing Interior Mechanism of Diaphragm Valve. Humidostat. The humidostat is a device to be placed in one ormore rooms of a building for maintaining an even percentage ofmoisture in the air. The apparatus consists of two essential parts—the humidostat and the…
Architecture · Building · Carpentry
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
