Author Description

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...to the main ironframes provided for 200-line boards in the same manner used for smaller switchboards. At the main' frame the cables are brought through the floor in a position depending on the 20-pair line blocks to which they are assigned. The potheads rest on the floor and are brought up alongside the vertical line of iron braces holding the line blocks to which the cables are connected. The cables to be connected to the top line terminals will naturally be brought in farthest from the bottom block._ The potheads should preferably be of same size and height of sleeve and the wires carefully laced and shellacked when formed and in place. T he form should be carried straight up and branched to the blocks at the iron braces, to which they should be neatly fastened by tape. The line blocks number from the top down and spare blocks should ordinarily be left at the bottom. A cable should be distributed on one vertical row of line terminal blocks. THE CENTRAL ENERGY STORAGE BATTERY. As indicated by its name, the central energy telephone installations obtain all the battery for their operation from one common or central source in the form of a storage battery. It is therefore one of the most essential features of the system, and particular care must be taken in its erection to insure reliability of service, as a failure of this battery renders the entire system inoperative. Asiwill be seen from an examination of the circuits for central energy switchboards all circuits center in the batteries, and the most important feature of the system should be the certainty that the busbar leads between the battery and switchboard and the battery have practically no resistance, as this part of the circuit is common to all talking circuits, and will be...