l.\I>EX TO VOLUME III. 



437 



OOETHE. 



Goethe's Spirit of the Earth, the 

 solar ray, 187, 188. 



Goldsmiths' Company, Siemens, C. 

 W., member of, 384. 



Gordon, L., Professor, succeeded by 

 Bankine, W. J. M., 84. 



Govi, dielectrics affected by electri- 

 fication, reference to, 353. 



Government purchase of telegraphs, 

 advantages and disadvantages of, 

 176, 176. 



Graebe and Licbermann, discovery 

 of alizarine by, 336. 



Grain ground in Carr's disintegrator, 

 83. 



Grammar schools, modern side in, 

 276. 



Gramme, dynamo-electric machine, 

 introduction of by, 368. 



Great Britain, annual coal produc- 



- tioii of, 81 ; and United States, 

 inhabitants, number of, per tele- 

 graph station, 175, 176. 



Great International Exhibitions, les- 

 sons of, 53. 



Great Pacific Railway, reference to, 

 57. 



Greiner, steel, definition of, refer- 

 ence to, 147. 



Grove, energy, researches on, refer- 

 ence to, 325 ; gas battery of, 409 ; 

 on gaseous atmosphere, reference 

 to, 299 ; physical forces, on identity 

 of, 184. 



Griiner, steel definition, International 

 Committee on, member of, 147 ; 

 technical writings of, reference to, 

 126. 



Griisen bolt, reference to, 59. 



Guilds, ancient trade, 263. 



Guilds in Germany abolished in 1869, 

 388; apprentices under,388; estab- 

 lishment of, in llth century, 388 ; 

 Gesellenstiick, 388 ; Guildmaster's 

 Committee, 388 ; marriage ar- 

 rangements under, 388 ; Meister- 

 stuck, 388 ; system at Liibcck, 



HEAT. 



888 ; Trades Arms in connection 

 with, 388. 



Guncotton and gunpowder, differ- 

 ences of effect when exploded, 

 351, 352 ; (explosion, temperature 

 of, 352 ; tension of, 351, 352) ; 

 Schonbein's discovery of, reference 

 to, 351. 



Gunpowder, composition of, varia- 

 tion of effect due to, 352 ; erosive 

 action of, on guns, 352. 



Guthrie'sdiacalorimeter,referenceto, 

 121. 



Gntta percha brittle under exposure 

 to light and air, 12 ; conductivity 

 of, changeable with temperature, 

 11 ; cultivation by Indian Govern- 

 ment of trees producing, 173 ; heat, 

 non-exposure to, important, 11 ; 

 and india-rubber as insulating 

 materials, 172 ; insulator perfect, 

 how formed with, 10 ; joints easily 

 and perfectly made, 12 ; lead tube 

 manufacturing process applied to, 

 10 ; pressure increases insulating 

 power, 11, 41 ; resistance varies 

 with temperature, 16 ; used first 

 in Kiel harbour in 1848, 10 ; water 

 absorption of, by, 12. 



HACKNEY, W., heat applied to fur- 

 naces, address on, reference to, 

 114. 



Hamoir, puddling researches, 150. 



Hardware and Metal Trades Pension 

 Society, Siemens's, C. W., remarks 

 at, 263 265 ; forty years' exis- 

 tence of, 265. 



Hasenfratz, in 1750, refers to three 

 processes of producing steel, 138. 



Hawkshaw, Sir J., steel for Charing 

 Cross Railway Bridge proposed by, 

 145 ; on Steel Committee, 145. 



Heat, ancient ideas regarding, 88 ; 

 applications, Siemens's, C. W., 

 worked at since 1846, 189; of 



