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Light Switch with Little Button

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This light switch had a teeny button on it. I have not seen this before. It toggled like a rheostat switch. Sometimes the light would turn on when I flipped it and sometimes it would not.

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A rheostat is a variable resister. I suspect dimmer controls are solid state, thought they mimic rheostat action.

I'm sure in ages long gone rheostats were used to control brilliance of incandescent bulbs. Technology changed but the term stuck.

So this little button isn't a lamp instead?


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