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Three switches

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Calvesy | 13:17 Sat 11th Jun 2005 | How it Works
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The landing light where I live is controlled by three switches, each of which can change the on/off state of the bulb.

How the dickens does that work?

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Just click: 4 way switch animation and watch the picture.
ezapf that is superb....5 stars
Thank you, Dom Tuk. I will accept one star and send the other four on to Mr. Matthews of Wake Forest University.
If you live right at the top of your building and have to keep pressing the switch,just force a matchstick into the first one and the light will stay on all night!!( :)

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