. The Bell System technical journal . (b) ASCENT(a > 7). (C) ASCENT {yxx) Fig. 19 — Cable geometry during straight-line descent and ascent laying. During descent laying we see from Fig. 20 that in a time / an amountof cable equal to a + 6 must be paid out. Hence the required paj-outrate Vc is (a -f- h)/t. But by straightforward trigonometry y _ ct + 5 _ sin a + sin /? y. t sin (a + &) (30) where jS is the angle of descent and a is the straight-line incidence angle. IIGO THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1957

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