Brian Roberts & Paul Yunnie compiled this document that contains beautiful vintage advertisements and illustrations of radiators from the mid to late 1800s and early 1900...
Hoffman Specialty Co. Heating System Information (1926)
This document is from the sales department at the Hoffman Specialty Co. in 1926. It showcases Hoffman Valves and Controlled Heat Equipment with cutaway diagrams of how the Hoffman No. 2 Vacuum Valve operates. There is also information on how to "vacuum-ize" a one-pipe steam system, the No. 7 Hoffman Adjustable Modulating Valve, Nos. 8 and 9 Hoffman Return Line Valves, the Hoffman Blast Trap, the Hoffman Ther-Kompo Gage, and the Hoffman Differential Loop. And there are diagrams outlining the typical installations of Hoffman "Controlled Heat" Equipment.
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