INDEX TO VOLUME III. 



429 



DEGREE. 



submarine in general, distinction 

 between, 7 ; (testing nf, 14 ; by 

 differential galvanometer, 17 ; by 

 galvanometer and Wheatstone 

 bridge,-16 ; Malta and Alexandria, 

 daring manufacture and submer- 

 sion, 14, 15 ; in pressure tanks, 

 16 ; standard mercury unit of re- 

 sistance, referred to, 15; at uniform 

 temperature, 16). 



Degree of hardening of steel not 

 defined, 148. 



Do la Rue, W., Aurora Borealis in 

 vacuum tubes, experiments on, 

 355 ; battery, high potential of, 

 354 ; stratified discharge, experi- 

 ments on, 354. 



De la Rue, W., and Muller, H., elec- 

 trical discharge, experiments on, 

 354. 



De Lesseps and Panama Canal, 348. 



.De Meriten's dynamo-machine, 400. 



Depression in prices due to foreign 

 competition, 209. 



Deprez, M., transmission of power 

 by, 406 ; apparatus employed, 

 406 ; Tresca's communication to 

 French Academic des Sciences 

 regarding yield in, 40G. 



Desert dust, electrification of, ob- 

 served by Siemens, Werner, 308. 



Designs in materials of different 

 strength, question considered, 62. 



Desirable residences to let, 96 ; 

 excellent " to sell," 97 ; gas, escape 

 of, from joints of pipes in place of 

 burners, 97 ; habitable to a degree 

 after repairs and alterations, 97 ; 

 smoke enters rooms in place of 

 chimneys, 97 ; water escapes 

 through ceiling, 97. 



Devillo on dissociation, reference to, 

 304. 



Devonshire, Duke of, Iron and Steel 

 Institute, first president of, 124. 



Dewar, J., on comets and meteorites, 

 reference to, 301. 



DYNAMICAL. 



Dielectrics affected by electrification, 

 :!.-.:{ ; Govi, Kerr, Dr., Quincke, G., 

 and Volta, A., on, reference to, 

 :5~>:i ; variation of physical pro- 

 perties of, :r>:5. 



Differential galvanometer, descrip- 

 tion of, 17 ; fixed and moveablc 

 resistance, coils of, 17. 



Dioptric lights, Stevenson, T., ad- 

 dress on, reference to, 113. 



Direct process of conversion of ores 

 to iron or steel, 192. 



Direct United States cable con- 

 ductor of. 172. 



Discovery, no end to, 235. 



Dissociation, affected by pressure, 

 304 ; Bunsen on, 304 ; Deville on, 

 304 ; by electric arc, 305 ; by solar 

 heat in plants, 305 ; temperature, 

 limit of, 99 ; tension of aqueous 

 vapour, 304 ; (w vacuum tube* 

 of carbonic acid and water, 305 ; 

 electric discharge in, 305 ; experi- 

 ments, description of, 305 ; perma- 

 nent gases produced, attempt to 

 collect and measure, 305). 



Domestic applications of heat, waste 

 in, 240, 246. 



Domestic consumption, wastefulness 

 of, 95. 



Douglass, Sir J., Eddystone light- 

 house, reference to, 349 ; Trinity 

 Board, report by, 178. 



Draper on oxygen in sun, 302. 



Dry goods by weight instead - of 

 measure. 420. 



Dudley, coal used by, for smelting 

 iron, 231. 



Duplex burner, brilliancy of, to what 

 due, 251. 



Duplex working, Muirheadon, refer- 

 ence to, 326. 



Dynamical equivalent of heat. 

 Joule's, 321. 



Dynamical theory of heat, Clausius, 

 Joule, Mayer, Rankine, reference 

 to, 105, 106. 



