The History and Progress of the Electric Telegraph

apparatus armature arrangement arriving attached attracted axis battery beam bottom cable carried charged circuit clockwork closed coating coils commutator connected consists construction continuation copper core corresponding covered cylinder deflected dial direction disc discharge distance earth effect electricity electro-magnet employed equal experiments feet fixed force give given held holes horizontal inches inserted insulated interrupted iron knot laid lead length letter lever lifted line-wire magnet marked means metal method miles Morse motion moved needle operator opposite passes permanent piece placed plate pointer poles position posts pressed prevent printing receiving relay released resistance rest round screw sending shaft shown side Siemens signals space spring station stop strip style supported surface teeth telegraph terminal tion tooth transmitting tube turning type-wheel upper vertical weight wheel whilst wire