American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 654
by reducing the weight of the glass withoutmaterially decreasing its strength. The manner in which both of these results aredesigned to be effected will be obvious on examining the illustration. In Fig. 410the tie wire is passed around the upper groove. The bulge above the upper groove WIRE… … W. U. INSULATOR. wire may still be held by the pin upon the cross arm. FIG, 414,
Telegraph
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