American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 652
rs, in thiscountry. glass insulator. Experience lias, however, also shown, in this country, that, given a wire freefrom foliage, kite tails, etc., the occasions are rare when a line well insulated with glasswill not work fairly successfully in ordinary wet weather. ^ On repeated occasions the… … Tlie styles of the American glass insulator vary in numerous ways, namel v: as to its shape, the location and depth of the groove for the wire, the depth of thehole for the pin. the number and depth of the screw-threads within the insulator fortiie pill, etc., but its general appearance will be…
Telegraph
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