Quote:
Originally Posted by Bilbo1967
1. Turn two of the switches to the 'on' position (call them 'a' and 'b') and wait five minutes. Turn 'b' off, but leave 'a' on. Go up to the attic; 'a' will be lit, 'b' will be unlit but hot, 'c' will be unlit and cold.
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That was quick! That's pretty much the answer I had, just a variant of:
Keep the first bulb switched on for a few minutes. It gets warm. Switch it off, switch another one on, walk into the room with bulbs, touch them and tell which one was switched on as the first one (the warm one), the second one will be on and the third can be easily identified.