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... It's very mysterious and
provides an excellent vehicle for explaining magnetic induction and
Lenz's law.
Our problem is that the little bobs have a tendency to disappear. I'm
sure our visitors don't steal them; they must oxidize into pure gase
s in 24 to 48 hours. I called Sargent Welch to get replacement bobs b
ut neither they nor their vendor sell only the bobs.
I am soliciting ideas on how to replace the bobs. They are cylindrica=
l, roughly 3/4-inch diameter and 2-inches long, are visually identica=
l. If necessary, we could use non-cylindrical bobs as long as they ar=
e visually identical and the correct size.