A few years we acquired some trick light bulbs of various colors, designed
in such a way that when the tip and threads are connected the light inside
comes on. Actually these are simply plastic bulbs containing complete
circuits inside, including a small wheat grain bulb powered by two small
watch batteries. We can't remember where we got them. Does anyone out there
know the source of these bulbs and if they are still available?
Thanks.
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Van E. Neie ven@physics.purdue.edu
Purdue University
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