Cooke and Wheatstone's single needle telegraph showing; left ; the front elevation with the alphabet and right the rear elevation and the galvanometer (G) and the commutator. 1874.
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Image Number: 1746-28993233Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:8763×7180
