Breguet and Roosevelt's method of handing telephones. Suspending fork, F, is a key switch which puts bell into circuit. From Amédée Guillemin Electricity and Magnetism, London, 1891.
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Image Number: 1746-28992813Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:3915×5356
