Electro-magnetic apparatus, _J. H. Abbot_, xl, 104.^f ---- - ---- ----, _P. Barlow_, v, 396.^f ---- - ---- ----, _A. W. Campbell's_ engine, xxxv, 343. ---- - ---- ----, _E. M. Clarke_, (magneto-electric) xxxiii, 213^f; --electrepeter, xxxiii, 224.^f ---- - ---- ----, ----, modes of experimenting with, in decomposing water, xxxiii, 217.^f ---- - ---- ----, ----, mode of giving shocks, xxxiii, 216.^f ---- - ---- ----, ----, mode of scintillating iron wire, xxxiii, 219.^f ---- - ---- ----, ----, mode of adjusting the intensity armature, xxxiii, 218.^f ---- - ---- ----, ----, rotation by magnetic electricity, xxxiii, 221.^f ---- - ---- ----, ----, mode of igniting charcoal, xxxiii, 222.^f ---- - ---- ----, _T. Davenport_, xxxii, Append. after 216; xxxiii, 193. ---- - ---- ----, ----, rotary, xxxii, 216^f, App., and 399. ---- - ---- ----, _T. Edmonson_, modification of Ampère's rotating, xxvi, 370.^f ---- - ---- ----, ----, rotating armature, xxvi, 205^f; xxxii, 399. ---- - ---- ----, _J. Henry's_ application of a galvanic multiplier, xix, 400.^f ---- - ---- ----, _J. B. Joslin_, xxi, 86.^f ---- - ---- ----, _J. Locke_, and on magneto-electricity, xxxiv, 125.^f ---- - ---- ----, _B. R. McConnell's_ rotating, xxxiii, 188. ---- - ---- ----, _C. G. Page_, xxxiii, 191^f; xxxiv, 364; xlix, 131.^f ---- - ---- ----, ----, double axial reciprocating engine, xlix, 139.^f ---- - ---- ----, ----, with revolving armature, xxxvi, 350.^f ---- - ---- ----, ----, _C. G. Page_, compound electro-magnet, xxxv, 253.^f ---- - ---- ----, ----, electrotome, xxxv, 112^f, 253.^f ---- - ---- ----, ----, reciprocating armature engine, xxxv, 263.^f ---- - ---- ----, ----, with vibrating armature, xxxv, 267.^f ---- - ---- ----, ----, circular galvanometers, xxxv, 259^f;--with double helix for inducing magnetism, xxxv, 261.^f ---- - ---- ----, ----, electrepeter, new form of, xxxiii, 377^f; xxxv, 112.^f ---- - ---- ----, _W. H. Pepys_, vii, 195. ---- - ---- ----, _M. Pixii_, xxiv, 144, 146^f, 196. ---- - ---- ----, _J. B. Zabriskie_, model of engine, xxxii, 313.^f ---- - ---- ----, ----, rotating, xxxvi, 129.^f ---- - ---- currents, _A. de la Rive_, xxxiv, 6. ---- - ---- disc of _Arago_, xxiv, 143. ---- - ---- induction, see _Electro-dynamic_. ---- - ---- and magneto-electric formula, xxxv, 356.^f ---- - ---- properties of metalliferous veins, _R. W. Fox_, xx, 136. ---- - ---- telegraph, _S. F. B. Morse's_, xxxiii, 185.^f ---- - ---- ----, see farther, _Magneto-electric_.