My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.gilareefer t1_iybffpy wrote
Reply to comment by D_daKid 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
Because it works well for this type of switch. Mercury is used as the conductor material in the switch... As the spring it's attached to heats/cools, the glass tube tilts & rolls the mercury into "on" position
D_daKid t1_iybi4b5 wrote
Interesting. I've seen these before in older buildings and it's always intrigued me. Thanks!
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