t not so easily if it were held in the hand, notwith- If the subscriber called for be in another exchange, seated at properly-equipped desks, assisting the oper- the “A” operator, after having inserted an answering- standing that it-might be provided with spirit or other ators in making difficult… … for the reason that the connec- illumination over a wide field. Al- tions are half completed at the though the lines may be ‘out of the calling exchange. Ringing-keys are provided, which operators, supervisors, and monitors; and its wire- perpendicular in the negative, there is no reason why when…
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![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-78-31.webp)
