(London, Richard and John E. Taylor, 1843). 4to. No wrappers as extracted from ""Philosophical Transactions"" 1843 - Part II. Pp. 303-327 and 2 lithographed plates.
Frst appearance of an importent paper in the history of electricity. ""In 1843 Wheatstone published an experimental verification of Ohm's law, helping to make the law (already well known in Germany) more familiar in England. In connection with the verification he developed new ways of measuring resistances and currents. In particular, he invented the rheostat and popularized the Wheatstone bridge (in the paper offered), originally invented by Samuel Christie.""(DSB).