466 



INDEX TO VOLUME II. 



LATERAL INDUCTION. 



Lateral induction, Siemens, Werner, 

 means of counteracting, 12. 



Law of resistance, electrical, general 

 applicability of, 150. 



Law of terrestrial magnetism, deter- 

 mined by Gauss, 19. 



Leakage of current, through insula- 

 tor, effect of, is retardation, 31 ; 

 increases with temperature, 31 ; 

 Newall, tests of, 31. 



Lee, R. B., on the riband telegraph 

 post, discussion of paper by, 132 

 137. 



Le Monnier of Paris, experiments in 

 electric telegraphs, 17. 



Le Sage of Geneva, in 1774, first 

 static multiple wire electric tele- 

 graph, 17. 



Leyden jar, submarine cable as, 29, 

 54. 



Light, continuous, beneficial effect 

 of, on growth, as regards aroma, 

 colour and size, 257. 



Lighthouse flashes produced by elec- 

 tric light, "244 ; importance of 

 telling own tale at longest dis- 

 tance, 245. 



Lightning discharger, form of, 129 ; 

 plate protector, description of, 

 129. 



Line wires, only absolute protection 

 to, 128 ; suspended without in- 

 sulators, 110. 



Lizard, electric and oil light at, 207 ; 

 compared as regards cost, 208. 



Lockyer, J. N., recent application of 

 electric arc to astronomical re- 

 search, 222. 



Locomotion, dynamo-electric, diffi- 

 culties of, 250 ; dynamo-electric 

 machine applicable to, 220, 241 ; 

 various available methods for elec- 

 tric, 249. 



Locomotive nearly as efficient as 

 stationary steam-engines, 265. 



Lomond's static electric single-wire 

 telegraph in 1787, 17. 



MATTHIESEN. 



Longridge, J. A., submerging tele- 

 graph cables, discussion of paper 

 by, 1415. 



Lorenz's determination of Siemens 

 unit, 217. 



Luminous rays not intercepted by 

 clear glass, 255. 



MACHINE for covering telegraph 

 wires with india-rubber, 65, 67, 69. 



Magneto-electric (currents, cause of 

 early failure of, 45 ; Faraday's 

 discovery of, 19, 119; how pro- 

 ducible, 25 ; tension of may be 

 indefinitely increased, and per- 

 ceptible duration of, 24) ; instru- 

 ments, failure of, Hightcn, E., on, 

 41 ; machines, dependent on per- 

 manent magnets, 119 ; needle in- 

 strument, Steinheil's, 19 ; needles, 

 Wheatstone's, 23 ; step by step or 

 dial instrument, 35 ; telegraph, 

 Gauss and Weber's, 19 ; and vol- 

 taic electricity, Highton, E., on, 

 41. 



Malta and Alexandria telegraph 

 cable, electrical tests used in con- 

 struction of, 90 ; insulation of, 91 ; 

 over previous cables, general supe- 

 riority of, 98 ; temperature of, rise 

 of proved by electrical thermo- 

 meter, 159 ; tested systematically 

 during manufacture and shipment, 

 91 ; untested on outward voyage 

 and during submersion, 91. 



Manipulation of dial instrument, 4. 



Manufacture of gutta-percha, recent 

 progress in, 109. 



Marine galvanometer, Thomson's, 

 Sir William, 169. 



Mascart's investigation of Gramme 

 machine, 216. 



Matthiesen (experiments of, on effect 

 of temperature on electrical resis- 

 tance, 142 ; within his limits of 



