490 



INDEX TO VOLUME II. 



STELLAR SPACE. 



ing property of. within limit of 

 elasticity, 315. 



Stellar space supposed filled with 

 rarefied gases, 425. 



Stevenson, T., flashing lights for 

 buoys, 313. 



Stirling's air engine, remarks oil, 

 327, 328. 



Stokes, G. G., convection, loss of heat 

 by, method of determining, 441 ; 

 on terrestrial attraction, 358, 372. 



Struve's objection to steel rails, re- 

 ference to, 308. 



Sugar making, boiler for, 321 ; engine 

 supplied with steam from saccha- 

 rine solution, 321 ; evaporating 

 apparatus for, 321 ; evaporating 

 entirely by vacuum pans, 321 : 

 (eraporati n/j jinn. 8/emens's, C.W.. 

 323 ; description of. 323 ; repeated 

 use of steam in, 323 ; Robertson's 

 modified, 323 ; steam blast for, 

 323); galvanic action, non-believer 

 in, 322 ; juice injured by raising 

 high pressure steam, 321 ; molasses, ! 

 crystallizable sugar, how converted 

 into, 321 ; processes, chemical and 

 mechanical in, 320 ; pump, centri- 

 fugal for, advantageous, 321 ; sul- 

 phurous acid for charcoal eco- 

 nomical in, 322. 



Sun, great heat of, modern notion. 

 445 ; radiation from, compared 

 with that of Swan incandescent 

 filament by Sir William Thomson, 

 435, 449 ; radiation from, one 225- 

 millionth part only falls on earth's 

 surface, 445 ; (temperature cf, de- 

 duced from that of incandescent 

 carbon as 2,700 to 2,800 C. by 

 Sir William Thomson, 435, 449 ; 

 deduced from platinum wire as 

 2,800 to 3,000 by Siemens, C. W., 

 435, 449 ; various views regarding, 

 435, 446). 



Swan incandescent light and sun's 

 radiation compaied, 435, 449. 



TERRESTRIAL ATTRACTION. 



TABLK of bathometer observations, 

 376 ; of water consumed as per 

 meter, and paid for, 293. 



Taylor's water meter, jet and impact, 

 286 ; piston. 277. 



Taylor, T, J., mining purposes, 

 machinery for. discussion of paper 

 by. 298. 



Tebay's impact water meter, 280. 



Telegraph steel wire tested to 80 or 

 90 tons, 399. 



Temperature, dependence of radia- 

 tion on, 434. 



Temperature and resistance of wire, 

 tables of, 442, 443, 444 ; of sun, 

 q. v. ; variations of water with 

 depth of Avell, 385. 



Terrestrial attraction (affected lj>/ 

 increase of density due to com- 

 pression, 362 ; mountains. plateaus, 

 continents, subterranean cavities, 

 itc., 359) ; decrease of. with depth 

 of water, ratio of, as depth 1 o 

 earth's radius, 362 ; elevation 

 above earth's surface, decreases as 

 height to half earth's radius, 378 ; 

 formula for, 358 ; (^instrument to 

 indicate slight variations in, 

 general conditions of, 358, 359 ; 

 seconds pendulum used by New- 

 ton, 359 ; spiral spring proposed 

 by Herschel) ; (investigation, 

 mathematical of, 360, 361 ; aggre- 

 gate of slices, earth considered as, 

 361 ; Newton's investigation, 

 agreement with, 362 ; ratio of, as 

 depth of section of solid earth to 

 two-thirds earth's radius, 362 ; 

 treatment of question, 361) ; lati- 

 tude, effects on, Newton, Ciairaut, 

 and McLaurin's investigations, 

 372 ; Newton on, 358 ; ratio of 

 variation over sea-water as depth 

 to earth's radius, 362 : (recent re- 

 searches on, 358 ; Airy, 359, 372 ; 

 Pratt, 372 ; Stokes, 358, 372) ; 

 strata near to attracted point, in- 



