My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.darrellbear t1_iybvsvj wrote
Reply to comment by WFPBvegan2 in My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on. by Iain_MS
It's called a mercury switch, used to be pretty common.
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