Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 153
applying method B, multiple onto each section of (ten) secondselectors as many sections of first selectors as will secure the propertraffic load. Provide as many such sections of second selectors as arenecessary to care for all the first selectors. There will thus be a numberof groups of trunks… … »— l—i — 1 — i — i — i — 1—1 — i — i - Z-Z-l-Z-Z-l-l-l— l-l-l-z-5—3-3-3—3-3-3—3-3-3-3-3—- 4-4—4—4—4—4-4—4—4-4—4—4-5—5-5-5- 5- 5-5- 5-5-5-5-5-5-5 -5-5- 5 -5- 5-5- 5-5- 5-5-6—6-6—6 — 6-6-6-6-6—6—6-6-6-6—6-6-6-6-6-G-6-6-6-6-7-7-7-7-7-7-7-7-7-7-1-1-7-1-7-7-7 -7 -7- 7- 7 -7- 7-7 -…
Telephone
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