428 



I^vDEX. 



Specimen of Hughes' printing, 65 ; 

 Bonelli's printing, 185. 



Speed of telegraphing, 419. 



SteinheiTs telegraph, 32; lightning- 

 guard, 206 ; earth circuit, 35. 



Stoehrer's telegraph, 172 ; code, 175., 



Sturgeon's electro-magnet, 24. 



Submarine key, De Sauty, 115; Sie- 

 mens', 113. 



Submarine board, 143. 



Sulzer, 14. 



Switch, submarine, 117. 



Tables. Co-efficients, 267; conducting 

 powers, 266 ; tin, 271 ; sulphuric 

 acid, 277 ; polarization, 279 ; gutta- 

 percha, 283 ; electro-motive forces, 

 325 ; copper conductivity, 356 ; 

 water absorption, 386. 



Tangent galvanometer, 237. 



Telegraphs, by friction electricity, 6 ; 

 galvanic electricity, 13 ; magneto - 

 electric, 21 ; now in use, 46 ; 

 C. M.'s, 6 ; Lesage's, 8 ; Lomond's, 

 9 ; Keusser's, 9 ; Don Salva's, 10 ; 

 Betancourt's, 10 ; Cavallo's, 10 ; 

 Konald's, 11; Soemmering's, 18; 

 Schweiger's, 20; Coxe's, 20; Am- 

 pere's, 23 ; Ritchie's, 23 ; Constadt's, 

 25 ; G-auss and Weber's 27 ; Stein- 

 heir s, 32 ; Wheatstone's, 36, 46, 50, 

 82 ; Morse's, 41, 131 ; Davy's, 42 ; 

 Siemens', 50, 75, 125 ; House's, 53 ; 

 Hughes', 55; Breguet's, 65; Kra- 

 mer's, 70 ; John's, 120 ; Digney's, 

 122; Bain's, 176; BakeweU's, 179; 

 BoneUi's, 182; Physiological, 219; 

 by sound, 146 ; double,*! 54, 160. 



Tell-tale, paying-out, 389* 



Temperature, 266, 282. 



Terra-voltaism, 230. - 



Testing joints, 370. 



Tests of core, 350 ; complete cable, 383. 



Theory, contact, 16; chemical, 17 ; of 

 Grotthuss, 215; of two fluids, 2; 

 of single fluid, 3. 



Thomson's galvanoscope, 249. 



Tourmaline, 1. 



Translation, 104; apparatus, 107; 

 spring, 141, 



Transmitting key, 41 ; plate, 90. 



Transmission, Grey, 2 ; Dufay, 3 ; 

 Winckler, 3 ; Lemmonier, 3 ; Wat- 

 son, 5 ; Franklin, 5. 



Type telegraph, 166. 



Unit of electro-motive force," 316 ; Eeg- 

 nault's, 316; DanieU's, 316. 



Unit of mercury, 318; absolute, 333 ; 

 alloy, 338, 



Varley's translating apparatus, 107 ; 



switch, 117; element, 227. 

 Vitreous electricity, 3. 

 Volta, Alexander, 16 ; theory of, 16 ; 



pile, 17. 



Voltameter, 232. 

 Vorselmann de Heer, 219. 



Water decomposed, 18 ; absorption of, 

 386. 



Watson's experiments, 5. 



Weber's galvanometer, 247 ; absolute 

 units, 333 ; telegraph, 27. 



Wheatstone's alarm, 39 ; relay sys- 

 tem, 40 ; telegraph, 43, 46, 50, 82 ; 

 balance, 290, 292; method, 319. 



Whitehouse's joint testing, 371. 



Wippe, 415. 



Wire, 195 ; preservation of, 195 ; joint- 

 ing, 196 ; suspension of, 198. 



Wooden posts, 185. 



Working, rate of, 419. 



Zinc amalgamated, 231 ; coated wire, 

 195; chloride, 186. 



THE END. 



VIRTUE AND CO., PRINTERS, CITY ROAD, LONDON. 



