My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on. Submitted by Iain_MS t3_z84a06 2 years ago in mildlyinteresting 91 comments 197
skittlebog t1_iyaykiz wrote 2 years ago That was a standard design. They would last for decades, because the contacts did not wear down. My grandfather's house had one of this design that kept working for 60 years. Permalink 3
My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.
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