Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
A Proposal for Warming Rooms by the Steam of Boiling Water Conveyed in Pipes Along the Walls
This document is subtitled "And also a Method of Preventing Ships from Leaking" and was written by Col. Wm. Cook. This original document is from The Philosophical Transactions of the Royal Society of London, 1745. This is the first time the possibility of heating buildings with steam is mentioned in a book.
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