In the earliest telephone switchboards the lines were connected to vertical conducting strips, across which were placed a series of similar horizontal strips in such a manner that any horizontal could be connected to any line strip by the insertion of a plug into holes provided in the strips for the purpose. [Please select]
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He described correctly the main principles involved in the use of telescopic and other lenses, he knew well the first principles of electricity, and he could draw correctly diagrams of dynamos, locomotives, switchboards, etc. [Please select]
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In an exchange used by many subscribers the terminals are distributed over a number of switchboards, each containing 80 to 100 terminals, and attended to by an operator, usually a girl. [Please select]
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I have seen girls at hotel switchboards, expert operators, working with conditions made to their order, who grew infinitely more excited at a busy time, when many calls were coming in and going out. [Please select]
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