Just curious, do you understand how a "fail safe" thermostat works?
If the "fail safe" thermostat FAILS and never opens, it cannot enter the "locked open" "failsafe" mode. NOT so much failsafe in that situation!
On the other hand, if you break a fanbelt, or some similar catastrophe happens, and the engine gets hott'r than 'ell and the 'stat responds accordingly and opens more than normal a metal locking device keeps it from ever closing again, just before it craps it's guts out from the heat.
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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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