Vintage Mercoid Mercury Pressure Switches

Just a quick video showing a pair of old Mercoid pressure switches I have.
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[@absurdism6]

Have run into these twice this week. On blower lines used for moving flour in a food plant.

[@fizgigwampus5782]

Just had to service a dinosaur of a sprinkler system and saw this type of switch. Told my boss about it and even he never saw one before.

[@general0ne]

The panel mount one was purchased on eBay for about $10, the other one was given to me by a neighbor.