Perfex Series 155 Magic Dial Thermostat
Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
1927 Proposal for a Mouat Vapor Heating System
Thanks to Gerry Gill for sharing this Mouat Vapor Heating System proposal from the early days of steam heating. Note the nine-ounce setting on the relief valve. You don't need high pressure to heat a building.
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