456 



INDEX TO VOLUME III. 



TIME. 



Time for everything, 300 ; waste of, 

 360. 



Toluene, for production of artificial 

 indigo, 337. 



Tooth, puddling, mechanical, refer- 

 ence to, 149. 



Toricelli, measurement of elastic 

 pressure by, reference to, 116. 



Touchstone of science and practical 

 experience, 53. 



Trade Guilds. See Guilds. 



Trade, iron and steel, depressed state 

 of, 160. 



Tramways, application of secondary 

 battery to, 410, 411. 



Transmission of power by Arm- 

 strong, Sir W., 407 ; by Deprez, M., 



406 ; (by electricity, 221, 286, 400, 



407 ; by compressed air and water 

 compared, 270, 329 ; criticism of, 

 221 ; Thomson's, Sir W., practical 

 law regarding, 406. and sugges- 

 tion to use currents of high electro- 

 motive force, 406). 



Transmission of telegraphic messa- 

 ges, 174. 



Tresca, Conservatoire des Arts et 

 Metiers, director of, 212, 215 ; 

 flow of solids, address on, refer- 

 ence to, 114 ; on transmission of 

 power, 406 ; Wheatstone, Sir C., 

 address on, reference to, 109. 



Tribe, secondary battery, on action 

 of, 410. 



Trinity Board, report by Tyndall, J. 

 and Douglass, 178. 



Tungsten steel, permanent mag- 

 netism of, 142 ; discovered by 

 Siemens, W., 142 ; tools, hard, 

 suitable for, 143. 



Tunis Algerian Chotts, proposed 

 flooding of, 348. 



Tunner, steel definition , International 

 Committee on, member of, 147. 



Tyndall, J., British Association 

 lecturer, reference to, 85 ; on 

 cause of blue colour of sky, 250 ; 



VEGETATION. 



heat, a mode of motion, work on, 

 by, 185, 325 ; heat, public know- 

 ledge of, increased by, 185 ; on 

 luminosity of gas flame, 340; 

 luminous and non-luminous rays 

 in electric arc, experiments on, 

 332 ; physical endurance of, 314 ; 

 radiant energy intercepted by 

 gaseous compounds, 304 ; radiant 

 heat, work on, by, 332 ; Trinity 

 Board, report by, 178. 



ULTIMATE theoretical and actual 

 effect, difference between, 325. 



Ultra violet rays, absorption of, by 

 clear glass, Stokes, G., on, 306 ; 

 dissociating power of light con- 

 fined to, according to Draper, 300. 



Underground telegraph wires, 171, 

 328 ; applied first by the Prussian 

 government in 1846, 171, 242, 328, 

 8,000 miles laid by German 

 government within 5 years, 242, 

 recently renewed in Germany by 

 Dr. Stephan, 171 ; cheapest in the 

 end, 242, 328 ; description of, 242 ; 

 maintenance, no expenditure for, 

 242 ; Siemens, W., introduced, 

 328 ; substitution of, for sus- 

 pended wires. 241. 



United Kingdom, merchant shipping 

 of, value of, 343. 



United Kingdom and United States 

 inhabitants per telegraph station 

 in. 176. 



VARLEY, S. A., dynamo - electric 

 principle, claim to discovery of, 

 considered, 163, 165, 166. 



Varley, S. A. & C.. dynamo-electric 

 principle, description of arrange- 

 ment to test, 105. 



Vegetation, effect of electric light 

 on. 330. 



