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Good Conductors—Silver, copper, gold, and other metals.

Partial Conductors—Human body, water, marble, cotton, wood and paper.

Non-conductors—Dry air, glass, porcelain, mica, gutta-percha, ebonite, silk and oils.

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Table of Dimensions and Resistances of Pure Copper Wire.*

REVISED.

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Table of sizes of wires for different current capacities of motors, and distances

from supply.

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