PugioilAudacio said:You don't really need the weight. Feeling the bulb to see if it's hot usually suffices in this riddle. As in,
Turn switch one on, wait a minute then turn it off. Then turn switch two on and run back to the other room. If it's on, great. If the bulb is warm, then it's switch one. If the bulb is cold, it's switch three.
We have a winner!