the building of the Academy of Sciences, and with the Royal Observatory at Bogenhausen, by means of 36,000 feet of wire for conducting the current from a magnetoelectric machine both ways, the wires being suspended in the air. He occasionally signalised between these places, having contrived to make a deflecting needle either strike a bell or mark black dots on a strip of paper. It was here that Steinheil first applied his so highly valued discovery that the earth may serve for conducting the return current, so that one half of the suspended wires became useless..
Already, in 1833, the . Cabinet of natural philosophy, of the University at Göttingen, had been by means of wires in the ah', united by Professor Wilhehn "Weber, with the Astronomical Observatory, distant 3,000 feet, to which, in 1834, was added the Magnetic Observatory, situated near it.
Although this had been done for other than telegraphic purposes, it was found that the large magnetometric needles
at the Observatories and in the Cabinet, could be easy set in motion by a feeble galvanic current, and this was used for some signalising. Subsequently, Steinheil, had, at his factory at Munich,made for Göttingen,a magneto-electric machine with which the signalising was performed more speedily.
