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Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)

D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 892

An illustration from Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts, 1880, leaf 892 — TELEGRAPH. 857 average percentage of gla?s insulators broken on the lines of the Western Union Company for aperiod of four years was 6.4. Fig. 4099 is an insulator of whitewood impregnated with a non-conducting compound, and arranged to hold the wire by suspension. … 4099. 4098.

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