...has been transmitted through a wire four miles long instantaneously, and without any diminution of intensity. Mr. Barlow, however, by employing wires...electric action by the deflection produced in a magnetic compass, found that the intensity diminished very rapidly, and was in fact very nearly as the square...

...through a wire four miles long instantaneously and without any diminution of " intensity ;" that he, however, by employing wires of various lengths, up...electric action by the deflection produced in a magnetic compass, found, that the intensity diminished very rapidly, and was, in fact, very nearly aa to the...

...through a very considerable distance (say three or four miles} instantaneously, and without any sensible diminution of its intensity. Mr. Barlow, however, by employing wires of various lengths u ji to 840 feet, and measuring the energy of the electric action by the deflection produced in a magnetic...