J\I>KX TO VOLUME II. 



471 



8CHWKNULER. 



Boh woodier, invwtigatkm of GnUuM 



in. I Siemens machine, 216. 



Scorching action of electric light on 

 plants, 229, 254. 



Screws, convergence of, manoeuvring 

 by, 181. 



Secondary batteries, available for 

 farm work, 260 ; contribution to 

 history of by Siemens, C. W.. 201 ; 

 (Grotc't gan, description of, 261 ; 

 brought out in 1841, 261 ; 

 Siemens's, C. W., proposed sub- 

 stitution of porous carbon for 

 sheet lead in, 2(!3). 



Selenium, crystalline, used in micro- 

 phone, 197. 



Self interception of currents, prin- 

 ciple of, 8. 



Selwyn, Capt. J., submarine cables, 

 art of laying, discussion of paper 

 by, 8890. 



Sheathing, first used for cables, 138 ; 

 iron wire, proposal of Brett. 39 ; 

 least perfect part of cables, 106 ; 

 necessity for, 87 ; Newall & Co.'s, 

 89; outer of Siemens 's, C. W., 

 cable, 107 ; rusting of iron of, 119 ; 

 spiral wire, 65, 138. 



Ship's sheathing, durability of, 

 110. 



Shoolbred, J. N., lighting purposes, 

 practical application of electricity 

 to, discussion of paper by, 198 

 200. 



Shunting current, suggested by 

 Wheatstone, 217. 



Siemens, dynamo-electric machine, 

 investigations of, 216 ; dynamo- 

 meter used by, 116 ; system of 

 testing, 77. 



Siemens, A., on electric railways and 

 electric transmission of power, 

 discussion of paper by, 248 252. 



Siemens, C. W. , (cable of, conductor 

 of, 107 ; description of, 107) ; car- 

 bon-lead electrodes for gas battery, 

 263 ; deep-sea electric thermo- 



8IEMEN8 AND HAL8KE. 



meter, 265 ; dynamo-electric prin- 

 ciple brought before Royal Society, 

 199, 214 ; (electric tlu>rmninctrr 

 of, 80 ; description of, 81, 85 ; 

 discovery of heating of Rangoon 

 cable by, 81, 84) ; electrode of 

 triple contact for Grove's gas 

 battery, 262 ; experiments on 

 variation of electric resistance 

 with temperature agree with 

 Matthiesen's within his limits of 

 temperature, 146 ; Grove's gas 

 battery, modification of, 261, 262 ; 

 gutta-percha sent by, to Siemens, 

 Werner, for experiment, 22 ; gutta- 

 percha for insulation, suggested 

 use of, 184 ; (iron telegraph poles, 

 construction of, 130 ; uniform 

 strength throughout of, 137 ;) law 

 of increase of electric resistance 

 with temperature, 147 ; platinized 

 carbon for gas battery, 262 ; 

 resistance measurer of, 121, 168 ; 

 secondary batteries, contribution 

 to history of, 261 ; secondary 

 battery, description of, 263 ; 

 sheathing, permanent, specimen 

 of, 107, 113 ; Wheatstone bridge, 

 early connection with introduction 

 of, 126. 



Siemens, C. W., papers by, 3 5, 16 

 37, 6574, 8486, 90108, 119 

 121, 121124, 129131, 137 

 141, 142179,201206,209214, 

 214219, 220244, 252260, 261 

 263, 265271. 



Siemens, C. W., electric telegraph, 

 progress of, 37 46; electrical 

 tests in construction of Malta and 

 Alexandria cable, &c., 108 110 ; 

 pyrometers, 124 126, discussion 

 of papers by. 



Siemens and Halske's, double relay 

 or translation system of working, 

 98 ; improved telegraph instru- 

 ments, 109 ; ink recording instru- 

 ment, 98 ; insulator, 25 ; instru- 



