Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 133
to theother strip, as shown in the lowerpart of the figure. The cause of thisparticular separation is purely histori-cal. The old switches had two sepa-rate line banks. In order for the proper connectionsto be made, these three strips aremounted on three separate supports,one above the other. The… … Fig. 101.—Development of selector board. order from the top downward is private, even level lines, odd level lines.If the A high and A low sections are to be multipled together, there TRUNKING, ITS PHYSICAL ARRANGEMENTS AND VARIATIONS 117 will be the two private strips on the first support, the two…
Telephone
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