International Library of Technology; a Series of Text Books for Persons Engaged in the Engineering Professions And Trades, Or for Those Who Desire Information Concerning Them
International Library of Technology; a Series of Text Books for Persons Engaged in the Engineering Professions And Trades, Or for Those Who Desire Information Concerning Them
International Textbook Company
The book International Library of Technology; a Series of Text Books for Persons Engaged in the Engineering Professions And Trades, Or for Those Who Desire Information Concerning Them was written by author International Textbook Company Here you can read free online of International Library of Technology; a Series of Text Books for Persons Engaged in the Engineering Professions And Trades, Or for Those Who Desire Information Concerning Them book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is International Library of Technology; a Series of Text Books for Persons Engaged in the Engineering Professions And Trades, Or for Those Who Desire Information Concerning Them a good or bad book?
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In Fig. 64 is shown a slnfirie spring-Jack s^vltchboard for use in a terminal office. Only two rows of disks, the fourth and fifth, are shown connected to the dynamos that supply current to the lines, but many more rows are usually connected in this manner. The disks in each row are not joined directly together behind the board, in this case, where dynamos are used, but are first con- nected to incandescent lamps or non-inductive resistance coils, and the other terminal of the lamp or coil is t...hen joined to the dynamo lead or bus-bar, as mentioned in Art. 203. To avoid making the figure too complicated, only two disks are shown connected through lamps to the bus-bars. All disks in the same horizontal row, excepting Digitized by VjOOQIC 150 TELEGRAPHY. § 2 those connected through lamps to the main-line dynamos, are joined together, as usual, by brass or copper horizontal strips behind the board. The bottom row is connected to the ground. 209* The bottom part of each spring jack is invariably connected to the vertical strap immediately above it, but the top terminals are connected in various ways.
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