476 



INDEX TO VOLUME II. 



VIENNA TELEGRAPH CONVENTION. 



Vienna Telegraph Convention 

 adopted Siemens, Werner, unit, 

 217. 



Voltaic or galvanic current for tele- 

 graphic purposes, 17. 



Voltameter, differential. See Diffe- 

 rential voltameter. 



Voltameter, difficulty of employing 

 for measuring resistances, 169 ; 

 Faraday's law of decomposition of 

 water in, 169. 



Vorsselmann de Heer, touch tele- 

 graph, 45. 



Vulcanised india-rubber unsuitable 

 as insulator, 104. 



WATERFALLS, aggregate loss 

 throughout the world from, 209. 



Waterpole for electric arc, descrip- 

 tion of, 225. 



Water-tight tanks for cables on 

 board ship, 92, 93, 117, 141, 159, 

 185. 



Watson of London, experiments in 

 electric telegraphy, 17. 



Webb, F. C., submarine telegraph 

 cables, paying-out and repairing 

 of, discussion of paper by, 1415. 



Webber's, Major, telegraph post, 

 discussion of paper by, 134, 135. 



Weber's, H. F., determination of 

 Siemens unit, 217. 



Webster, T., submarine telegraphy, 

 discussion of paper by, 87 88. 



Weight borne by telegraph posts, 

 136. 



Weinhold, Prof. A., use of electric 

 pyrometer, reference to, 266. 



Wheatstone (bridge and differential 

 voltameter, comparison of, 178, 

 179 ; disadvantages of, 122; refer- 

 ence to, 121 ; resistance boxes 

 added to, by Siemens, Werner, 

 126 ; Siemens, C. W., early con- 



WRAX'S MIXTURE, 

 nection with introduction of, 126 ; 

 for testing purposes, 50, 78, 94, 

 168) ; dial, etc., instruments and 

 magneto- electric arrangements of, 

 21, 23, 37 ; dynamo-electric prin- 

 ciple brought before Royal Society, 

 199, 214 ; proposed cable from 

 England to France, 26 ; shunting 

 current from electro-magnet, 217 ; 

 (telegraph, compared with those 

 that preceded, 21 ; modification 

 of, 20 ; principle of, 20, 21) ; on 

 velocity of electricity, 20. 



Wheatstone and Cooke's electilc 

 telegraph, 20. 



Whitehouse on retardation, &c., 12 ; 

 telegraph arrangements of, refer- 

 ence to, 23. 



Wigham, advantages of ex-focal 

 light, reference to, 208. 



Williamson, A. W., Prof., on electric 

 pyrometer, 165. 



Window, F. R., electric telegraph, 

 and the principal improvements 

 in its construction, 5 11 ; sub- 

 marine electric telegraphs, 11 

 13, discussion of papers by. 



Winkler of Leipzig, experiments iu 

 electric telegraph, 17. 



Wire, charge and distribution along, 

 formula for, 63, 64 ; insulated with 

 india-rubber and gutta-percha 

 under trial, 105 ; sheathed cable, 

 106, 107. 



Wol) astone, cable laid by, from Dover 

 to Calais, 26. 



Wooden posts injected with sulphate 

 of copper or creosoted destroyed 

 by rot, 132. 



Working speed, telegraph, meaning 

 of, 109. 



Wray's mixture, india-rubber and 

 gutta-percha as insulating mate- 

 rials, 83. 



