. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. NEW YORK-CHICAGO CABLE 85 ings to furnish current of the proper characteristics for operating the apparatus, and storage batteries are provided to insure uninter- rupted service. As an indication of the size of these plants the 24- Nolt storage batteries installed for the initial load at Bedford have a capacity of 2240 ampere-hours and this provides about one day's reserve. The capacity can, of course, be increased as repeaters are added from time to time when addition
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. NEW YORK-CHICAGO CABLE 85 ings to furnish current of the proper characteristics for operating the apparatus, and storage batteries are provided to insure uninter- rupted service. As an indication of the size of these plants the 24- Nolt storage batteries installed for the initial load at Bedford have a capacity of 2240 ampere-hours and this provides about one day's reserve. The capacity can, of course, be increased as repeaters are added from time to time when additional circuits are needed. Storage batteries of smaller sizes supplying current at potentials of 30, 120 and 130 volts are also provided. Examples of Circuit Arrangements Fig. 30 shows two possible methods of building up a Philadelphia- Pittsburgh terminal circuit and Fig. 31, a method of building up a New York-Pittsburgh terminal circuit. In all three cases these telephone circuits are intended to have a transmission equivalent of about 12 miles of standard cable. Some Philadelphia-Pittsburgh. Fig. 29—Test and Repeater Station at Ligonier, Pa. terminal circuits of the first type have been in everyday operation for several months, but it is not the most economical arrangement that it is possible to obtain for general use in providing this or similar service. It will be noted that No. 19 four-wire facilities are used between Philadelphia and Harrisburg and four-wire repeaters are located at these two points. At Harrisburg the four-wire circuit is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
Size: 1765px × 1416px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
