Kirkman, Marshall Monroe, 1842-1921 · New York, Chicago, The World Railway Publishing Company · leaf 196
over what is known as an order wire which permits the operator at the orignating end to speak directly into the ear of a trunk operator at a dis- tant office. The connection then, instead of being made directly, will be put up over a trunk line. The same signals as described are used with the… … LINE %/ DIAGRAM SHOWING METHOD OF CONNECTING TWO SUBSCRIBERS' LINES plays a lamp in front of the trunk operator at the distant office, which signifies to her that the trunk line is no longer in use. The operators at the dis- tant office who put up these trunk connections do nothing else. They never…
Railroads · Transportation
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