EntityQ96376869· pop 5· linked from 15 articlesEarth-return telegraphSign in to savetelegraphy transmission methodConnectionstramEntitygroundEntityNew York CityCitycopperEntityCape TownEntityPhiladelphiaEntityCarl Friedrich GaussEntityCyrillic scriptEntityLeipzigEntityInternational Standard Book NumberEntityelectric currentEntitytelecommunicationsEntityAndré-Marie AmpèreEntityWayback MachineEntitydigitEntitySamuel Finley Breese MorseEntityLong IslandEntityelectrical circuitEntitytelegraphyEntityelectromagnetic inductionEntityCategoriesHistory of telecommunicationsTelegraphy