Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 290
FIBRE TUBE … MULTIPLE CLAY -2-1I4. -» 3 ^- I -^^-^21 ->)U^| ^ wmBm. k:±^ -5^->}-^5^-^-57^8-^ SINGLE CLAY Fig. 8. duit is dispensed with, thereby reducing the cost of in-stallation. Manholes, or conduit-openings, are located along theconduit line at suitable distances apart, rarely greater than700 feet, to…
Telegraph
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