488 



INDEX TO VOLUME 1L 



SIEMEN. 



Siemens's circuit system of pneumatic 

 transmission. See Pneumatic Cir- 

 cuit System, S.'s, C. W. 



Siemens, C., circuit system of pneu- 

 matic despatch tubes, discussion of 

 paper by, 319, 320. 



Siemens, C. W., cast-iron ball floating 

 on cast-iron bath, hypothesis re- 

 garding, 409 ; dissociation in tubes 

 containing rarefied gases shown by 

 electric discharge through, 450 ; 

 flashing lights, proposals regarding, 

 313 ; hematite ore, production of, 

 hypothesis regarding, 338 ; hydrau- 

 lic, compressor, connection with, j 

 417 ; laminar compressor, hydraulic ! 

 apparatus for proposed, 330 ; papers | 

 by, 27.V289, 289-296, 358-384, j 

 389-397, 423-434, 434-444, 445- 

 450 ; projectiles, method for deter- 

 mining force acting on, 300 ; sele- 

 nium eye, sac Selenium eye ; steel 

 springs, experiments on, 369 ; steel 

 tube heated and acted on internally 

 by jet of water would shrink in 

 direction of thickness not of dia- 

 meter, 405 ; on sun's temperature, 

 2800 C. to 3000 C., 435, 449 ; 

 water meter, see Water meter, 

 Siemens's. 



Siemens's, Wer., dust illumination by 

 electricity, observation of, 432 ; 

 velocity of shot, determination of, 

 300. 



Signalling on German railways, 303, 

 304. 



Signals fixed for railways, 332. 



Sleepers of steel at low cost, 416. 



Smith, C., iron ores of Sweden, 337- 

 339. 



Smith Willoughby's investigations 

 on selenium, 410. 



Society of Arts patent bill, 414. 



Solar energy, conservation of, hypo- 

 thesis, Siemens's. C. W., 423 ; 

 carbonic acid and carbonic oxide 

 cannot exist in sun's atmosphere, 



SOLAR ENERGY. 



427 : (comets, how accounted for, 

 432, 433 ; considered as meteoric- 

 stones, 433 ; nucleus of, original 

 light from, 433 ; nucleus of, 

 contains meteoric gases, 426 ; tail 

 of stellar dust rendered luminous, 

 433 ; velocity of, very great, and 

 consequent high temperature of, 

 433) ; conditions fundamental of, 

 433 ; currents inflowing and out- 

 flowing, balance of, 431 ; disso- 

 ciated vapours compressed into 

 solar photosphere, exchanged for 

 reassociated vapours by means of 

 sun's centrifugal action. 434 ; (dix- 

 xociation, 428 ; Bunsen on, 428 ; 

 Ste. Claire Deville on, 428 ; on what 

 dependent, temperature and pres- 

 sure, 428 ; in leaf-cells of plants, 

 of carbonic acid and water by 

 solar ray, 429 ; in space at low 

 temperature by solar ray, 428, 429, 

 430 ; of vapours rarefied in glass 

 tubes, experiments on, 429, 430) ; 

 explosions on sun's surface ac- 

 counted for, 431 ; fan-like action 

 assumed, 428 ; (gaseous atmos- 

 pliere in space, i3l ; dissociation 

 of by radiant solar energy possible, 

 434 ; existence of supposed, by 

 Grove, Humboldt, Newton, Wil- 

 liams, M., and Zoellner, 426 ; no 

 limit to, according to molecular 

 theory of Clausius, Clerk, Maxwell, 

 and Thomson, 426 ; around plane- 

 tary bodies, 425 ; proved by spec- 

 trum analysis, 426 ; retardation to 

 planetary motion, slight, 427) ; 

 gases drawn into sun, 428, and 

 thrown again into space, 428, 430 ; 

 (liypotlieses of, 424 ; convection 

 currents from within outwards of 

 Stokes, G. G., and of Thomson, Sir 

 Wm., 424 ; meteorites falling into 

 sun, of Mayer, Thomson, Sir Wm., 

 and Waterston, 424, 425 ; by resto- 

 ration to sun of radiant energy, 



