{"id":6043,"date":"2026-06-22T09:32:50","date_gmt":"2026-06-22T14:32:50","guid":{"rendered":"https:\/\/commons.princeton.edu\/josephhenry\/?page_id=6043"},"modified":"2026-07-10T10:32:54","modified_gmt":"2026-07-10T15:32:54","slug":"jh-horseshoe-telegraph","status":"publish","type":"page","link":"https:\/\/commons.princeton.edu\/josephhenry\/jh-horseshoe-telegraph\/","title":{"rendered":"JH Horseshoe Telegraph"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text css=””]1060 ft of 17-gauge silk-insulated wire<\/p>\n

5.06 ohms per thousand feet – > 5.3636 ohms of resistance in the wire around his classroom.<\/p>\n

scientific papers of joseph henry vol 1<\/a><\/p>\n

The experiments relevant start on page 37, and he begins to describe the electromagnetic telegraph on page 41.<\/p>\n

Describes the effect of varying distances of wire on the deflection of a galvanometer, noting that the tangent function of the ratio of deflections was roughly equivalent to the ratio of the square root of the distances.<\/p>\n

It seems that experiments 3 and 4 were performed with a single galvanic cell battery using 2″x2″ plates of copper and zinc. But experiments 5 and 6 were done with a 4×7 inch zinc plate surrounded by copper. Finally, experiment 7 was done with a Cruikshank’s trough “containing 25 double plates, and presenting exactly the same extent of zinc surface to the action of the acid as the battery used in the last experiment<\/em>“.<\/p>\n

Over the experiments, it was noted that the mass magnetism was affected by the length of the wire and the strength of the battery.<\/p>\n

Summarized effect on mass lifted throughout experiments:<\/p>\n