My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.dwarfgiant6143 t1_iychnfx wrote
Reply to comment by Iain_MS 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
just the mercury. The thermostats were basically bulletproof otherwise.
Iain_MS OP t1_iydc5pj wrote
Okay, good to know! Thank you
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