480 



INDEX TO VOLUME II. 



DANIEL, W. 



DANIEL, W., underground haulage, 

 compressed air machinery for, dis- 

 cussion of paper by, 335-337. 



Decimal measure, standard unit of, 

 305. 



Deep-sea sounding by Sir William 

 Thomson's pianoforte wire ap- 

 paratus, 333 ; Prony brake, ap- 

 plication of, 334 ; drum, checking 

 motion of, by single rope, 334 ; 



- flying, soundings by, 334 ; stop- 

 ping machine when weight touches 

 bottom, 334 ; strength, uniform 

 necessity for, 334 ; soundings 

 taken in one-eighth former time, 

 334 ; value, practical, of appa- 

 ratus, 334. 



Density of metals, change of, with 

 change of physical conditions, 409. 



Depth of sea, measurement of, with- 

 out sounding-line, by bathometer, 

 363. 



Details in construction, importance 

 of, 317. 



Deville, Ste. Cl., on sun's tempera- 

 ture, about 3000 C., 435. 



Dewar, J., energy absorbed, and 

 temperature of heated wire, 440 ; 

 on sun's temperature, 16,000 C., 

 435. 



Dioptric and catoptric lights, bril- 

 liancy of, relative to distance, 

 311, 312. 



Direct acting and pumping engines 

 compared, 298. 



Dissociation. Bunsen on, 428 ; on 

 what depends, 428 ; Deville, Ste. 

 C., on, 428 ; as affecting Sie- 

 men's, C. W., solar hypothesis, 449 ; 

 in space of attenuated vapours by 

 solar rays, 428, 430. 449. 



Draper, oxygen in sun, 427. 



Dulong and Petit, dependence of, 

 radiation on temperature, 435 ; 

 expansion of steel, experiments 

 on, 368 ; radiation, formula for, 

 434. 



EXPANSION OF AIR. 



Dynamo-electric machine, applica- 

 tion of, 388. 



EARTH'S quadrant, measurement of, 



306. 

 Elasticity, limit of, not absolute, 



316 ; of steel springs, coefficient 



of diminution of, 369. 

 Electric arc, duties of solar light, 



capability of performing, 447 ; 



rays injurious, and necessary to 



plant growth in, 447. 

 Electric conductors, transmission of 



power of, 388. 



Electric deposition in metallic solu- 

 tion between conducting surfaces, 



338. 



Electric light for public, works, 388. 

 Electric resistance, dependent on 



temperature, Bakerian lecture on, 



436, 448 ; formula for,. 436, 448 ; 



verified by Weinhold, Professor, 



as regards platinum, 436. 

 Elevation above surface, influence 



on terrestrial attraction, 377. 

 Ende Max Am girder bridges, weight 



and limiting dimensions, discus- 

 sion of paper by, 412, 413. 

 English patent law, advantageous to 



inventors, and the public, 342. 

 Ericsson's, Capt., piston water-meter, 



278. 

 Ericsson, J., on sun's temperature, 



2,000,000 to 4,000,000 C., 435. 

 Erosion of guns, 343. 

 Evaporating apparatus for sugar 



making, 321, 323. 

 Evaporation and absorption system 



of refrigeration, 325, 

 Examination of patents. See 



Patents. 

 Expansion of air, Professor Unwin 



on, 353 (into tube, consideration 



of, 350 ; dissimilar to that behind 



piston, 350 ; dynamical formula 



not applicable to, 350). 



