This chapter on hot water heating systems and piping was prepared by Professor F.E. Giesecke (Director of Texas Engineering Experiment Station in TX) for the The American...
Johnson Vapor Heating Systems Bulletin
Johnson Vapor Heating Systems was of the more obscure systems from the Turn of the Century. This bulletin from Johnson Vapor Heating Co. outlines how the system works. Thanks to Alex Marx for sharing this rare document with us.
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