The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 180
will be seen that the Nos. 0, 5, 10,and 15 of the strip are rendered prominent by large dots, asa guide to the operators. The numbers are really white on ablack ground. The strips measure 7-f inches by § inch, andthe jacks are set f inch apart.Plugs.—These are made either 2-way or 3-way. Fig.… … »■ COVER Fig. 175.—Full size an interior rod to a terminal in the body of the plug, andanother terminal connects to the main body and sleeve. Theterminals are often in the form of soldering tabs, and greatcare is then necessary to prevent short-circuiting of the plugsby solder. The 3-point plug is,…
Telephone
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