“What is this round, frosted glass thing in the corner of the ceiling of every room in our Airbnb?”
“Looks like motion sensors to me for a security system. I’ve had the same ones installed in my last house. They would be at least 15 years old. Modern ones are far subtler.”
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Abijah 1 year ago
at number 5 - its a stamp for the usage of a electric circuit. Just mirror it an you will see. greetings
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Oswald 1 year ago
Abijah,
Not so much as a stamp, as a printing plate. Before ink jet printers, they would ink these up, and press paper against them.
Not so much as a stamp, as a printing plate. Before ink jet printers, they would ink these up, and press paper against them.
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Charles 1 year ago
Abijah,
The dial on the right sets the resistance in Megaohm as far as I can read. If I see that correctly its the printing plate for manual for an old X-Ray machine. Only those kathode tubes (at the bottom) would akquire such high voltage (200V)
The dial on the right sets the resistance in Megaohm as far as I can read. If I see that correctly its the printing plate for manual for an old X-Ray machine. Only those kathode tubes (at the bottom) would akquire such high voltage (200V)
Not so much as a stamp, as a printing plate. Before ink jet printers, they would ink these up, and press paper against them.
The dial on the right sets the resistance in Megaohm as far as I can read. If I see that correctly its the printing plate for manual for an old X-Ray machine. Only those kathode tubes (at the bottom) would akquire such high voltage (200V)