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Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 290
I2 3 4 6 8 12 16 20 0.390.56 0.730.830.971.171.401.671-95 0.440.670.880.911.22 1-551.982.422.94 0.731.030.98 1-371.64 2.II2.723.22 0.76 I-051.091.461.92 2.453.01 3-63 TELEGR-\PH LINES AND CABLES 275 This table is based upon the spacings shown in Fig. 8,but with multiple-duct vitreous clay conduit i… … FIBRE TUBETelegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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