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Author Topic: platinum lead-in wires  (Read 5059 times)

Offline staticcling

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platinum lead-in wires
« on: August 06, 2002, 05:58:00 am »
Howdy all...i'm wondering about the diameter of the platinum lead-in wires typically used in the days before Dumet...I would be greatly indebted to anyone who owns both an antique bulb and a pair of callipers...
    Thanks much.

Offline Ed Covington

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platinum lead-in wires
« Reply #1 on: August 07, 2002, 05:23:00 pm »
According to an article by Marshall in the J. Franklin Institute, in 1881 the platinum wire diameter was 0.012-inch. About 1889 the wire size was reduced to 0.010-inch.