»2 Conical Conductors and
2 Plate Conductors«, c. 1915
1) 2 conical conductors for demonstrating the different distribution of electricity across the surface of an insulated conductor, height 15 3/4 in. - And: 2) 2 metal plates, used as conductors, for producing a high-tension field, height 24 4/5 in.
Estimate: € 300/500
US$ 350/600
Reserve: € 120/US$ 142
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