Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 190
having long horizontal runs; and there is absence ofwater-hammer. Fourth — smaller return pipes may be used.The two older systems of this kind in common use are known as theWebster and Paul systems; other systems of recent introduction aredescribed in the Instruction Paper on Steam and Hot-Water… … Pig. 128, Air Outlet-Valve for Radi- Tttor, Automatically Operated by Expansion and Contraction of Vulcanite Stem. 151 142 HEATING AND VENTILATION
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