in greater resources in have been proposed and tried. The Direction Générale and the units corresponding to the number called the combinations the two line wires are used separate- des Postes et des Télégraphes, which has conducted up. Such combination of the apparatus, which is ob- ly, and one or… … aii) 22 ‘tee kag bt) at Ore CO) = rst orem gf Or oF of er pine! ser ai i Davy dn 1 hay (hee "bac tia iy if in Hf _—— Fig. 1.—DETAILS OF A SUBSCRIBER’S COMMUTATOR AT THE CENTRAL STATION. cumstances, the earth being used as a return cir- tained by means of the third contact pin, is analogous tion…
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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-cu31924022817674-46-8.webp)
![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-68-27.webp)
