. The Bell System technical journal . Fig. 43—^Typical aerial toll cable construction showing loading point. being extended very rapidly on a number of important routes. Mul-tiple tile duct with small splicing manholes located at intervals of229 meters and large manholes for loading coil pots at intervals of1,830 meters are generally used. For routes on which the growth is relatively light, for example,40 or 50 circuits a year and where underground construction is de-sirable, two other types of construction have been used to a limitedextent. In one type the cable is placed in a single duct of
. The Bell System technical journal . Fig. 43—^Typical aerial toll cable construction showing loading point. being extended very rapidly on a number of important routes. Mul-tiple tile duct with small splicing manholes located at intervals of229 meters and large manholes for loading coil pots at intervals of1,830 meters are generally used. For routes on which the growth is relatively light, for example,40 or 50 circuits a year and where underground construction is de-sirable, two other types of construction have been used to a limitedextent. In one type the cable is placed in a single duct of fibre andin the other type of construction cable covered with a double layer ofsteel tape is placed directly in the earth. With both of these typesof construction, manholes are built only at loading points. 54 BELL SYSTEM TECHNICAL JOURNAL In many places the character of the country is such that under-ground construction would be very expensive. In such cases, andin other cases where it seems desirable, aerial toll cable constructi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
