INDEX TO VOLUME II. 



SIEMENS, WERNER. 



ments, recording, dial and step by 

 step, 37. 



Siemens, Werner (dial instruments, 

 advantages of arrangement, 23 ; 

 peculiar principle of, 23 ; self- 

 acting, 23 ;) (dynamo-electric prin- 

 ciple, (brought before Berlin Aca- 

 demy, 199 ; conception of, 214) ; 

 electric charge first observed by, 

 44, 64 ; electric telegraph, im- 

 proved, of, 3 ; electric telegraph 

 instruments of, description of, 3 ; 

 exploding gunpowder in Kiel 

 Harbour in 1848, application of 

 electricity to, 127 ; {gutta-perclia 

 cylinder covering machine, 12, 22, 

 184 ; experiments on for insulat- 

 ing in 1846, 11, 22, 138) ; india- 

 rubber tried by, for insulating 

 underground wires, 67 ; lateral 

 induction or electric charge in 

 wires, devised means for counter- 

 acting, 12 ; (mercury unit of 

 resistance, 50, 78, 93, 217 ; adopted 

 by Vienna Telegraph Convention, 

 217 ; Lorenx's and Weber's deter- 

 mination of, 217) ; paying out 

 apparatus to regulate strain on 

 telegraph cables, 14 ; producing 

 electricity without permanent 

 magnets, experiment of, 119 ; on 

 Prussian Koyal Telegraph Commis- 



- sion, 11, 22 ; submarine cables, ex- 

 periments on, 30, 64 ; submerged 

 cable in Kiel Harbour in 1848, 12, 

 22 ; telegraph system, 5 ; tried 

 india-rubber and gutta-percha for 

 insulating underground wires, 67, 

 99 ; universal galvanometer, 168 ; 

 Wheatstone Bridge, first use of, 

 126. See Siemens, W., and C. W., 

 and Frischen. 



Siemens, Werner, chemins de fer 

 electriques, 264 265 ; submarine 

 telegraphs, theory of submerging 

 and testing, 183 187, discussions 

 of papers by. 



SOLENOIDS. 



Siemens, Werner and C. W., sub- 

 marine electric telegraphs, elec- 

 trical conditions of, paper by, 47 

 65. 



Siemens, Werner, and Frischen's 

 method of doubling transmitting 

 power of cable, 36. 



Siemens, Werner, and Thomson, W., 

 same formula for inductive capa- 

 city, 56. 



Silver, increase of resistance of, with 

 temperature, table of, 157. 



Silver's improved method of covering 

 wire with india-rubber, 68. 



Sine galvanometer, with additional 

 coil, 122, 123 ; for insulation tests, 

 51 ; for resistance large referred 

 to, 122 ; resistance substituted for 

 degrees in, 51, 93. 



Single needle telegraph, Fechner's, 

 18 ; Schilling von Canstadt's, 18. 



Slack, in paying out cables, 186. 



Sliding curve in resistance measurer, 

 124. 



Smelting, importance of high tem- 

 perature thermometers for, 159 ; 

 electric resistance pyrometer used 

 in, 167. 



Smith, W., reference to Newall & 

 Co.'s iron sheathing, 39. 



Smith, Willoughby, crystalline sele- 

 nium in microphone, experiments 

 with, 197. 



Society of Arts gutta-percha com- 

 mittee, 42. 



Soemmering, in 1808, first voltaic 

 multiple wire telegraph, 17. 



Solar light and electric light, com- 

 parable effects of, on vegetation, 

 252. 



Solar ray, action of, on plant life, 

 227. 



Solar spectrum, experiments on plant 

 growth, 237, 240 ; plant cultiva- 

 tion in, Draper on, 256. 



Solenoids, attractive force of, on 

 iron cores, 223. 



