Modern practice of the electric telegraph. A handbook for electricians and operators (1872)
Pope, Frank L. (Franklin Leonard), 1840-1895 · New York : D. Van Nostrand · leaf 187
Agents for Gutta-Percha Covered Wire and Cables, American Manufacture; Agents of American Compound Telegraph Wire Company; SOLE AGENTS FOR Brooks Patent Paraffine Insulator. This Insulator, as now constructed, is, beyond question, the best in use.MANUFACTURERS OF JONES PATENT LOCK SWITCH BOARD. e… … MANUFACTURER OF TELEGRAPH INSTRUMENTS,BATTERIES AISS MATERIALS, SOLK MANUFACTURE OF THE GRIGim CELEBRATED EMI- A. All Instruments and Materials used in furnishing and working TELEGRAPH LINES, • including Registers, Belays, Main Sounders, Local Sounders,Keys, Switches, Cut-outs, Galvanometers,…
Telegraph
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