Posted by showcrop on July 22, 2018 at 14:39:58 from (75.68.37.174):
I have been taking up flooring as part of the process for putting down a new floor. There were two half inch holes in the old wide pine floor boards an inch from a wall. Then in the basement I found next to one hole, a small pulley with a one inch wheel that aligned with one of the holes. This pulley also aligned with where a coal fired boiler would have been. This told me that there was a control of some sort mounted on the wall above the holes. A quick search showed me a diagram of a thermostatic control for the draft of a boiler which connects to the boiler by a pair of cables running through pulleys. The house where I grew up which was built in 1949 had hydronic heat via an oil burner and cast iron radiators. I know that there were however still plenty of coal fired boilers well into the sixties. Does anyone remember a thermostat that controlled the boiler by this type of system?
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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