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I had it in mind that Herb's local plumbing stores carry
...If a 10 cm specimen is heated slowly and
uniformly from room temperature to 30 degrees above room
temperature, there should be no problem counting the
45 fringes that shift during the heating process.
Using copper heat pipe sounds interesting. Any idea of the
cost of a 20 cm length?? Where can such a sample be obtained??
Herb Gottlieb from New York City
(Where our local plumbing stores carry heat tapes)