The book Toll Telephone Practice was written by author John Bernhard Thiess Here you can read free online of Toll Telephone Practice book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Toll Telephone Practice a good or bad book?
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Graded Pole Line. very easily overcome by the use of long and short poles. The re- quired lengths of the poles can be readily estimated by an experienced man, if the level of the country is not subject to unusual variations; but in very hilly country it may be profitable to make a preliminary survey of the route, from which a profile map may be prepared to aid LINE CONSTRUCTION 275 in selecting pole lengths. When these preliminaries have been com- pleted the distribution of material may be comm...enced. In this connection it should be remembered that the pole ought to be placed with the butt end closest to the stake, and that if the country is hilly the small end of the pole should be located at the highest point of the grade. By observing these suggestions the work of the pole- raising gang will be greatly facilitated. It hardly seems necessary to add that the stoutest poles should be placed at the corners and points where exceptional stresses are likely to be encountered. The poles of best appearance should be used in towns and cities.
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