474 



INDEX TO VOLUME II. 



SUBMARINE & OVERLAND ROUTES. 



communicating and receiving in- 

 struments, 33 ; suitable instru- 

 ments for, 27 ; tendency of to 

 slide through water, 27 ; testing 

 of, in paying out, 58, 59 ; velocity 

 of sinking,one-quarter to one-third 

 that of vessel, 27 ; voltaic induc- 

 tion in, 31 ; weight of, analysis of, 

 14, 15. See Cable. 



Submarine and overland routes to 

 India considered, 194 ; in war 

 time, 195. 



Sugar production in fruit, first stage 

 of decay, 240. 



Suspended line, consists of, 25 ; and 

 underground lines considered, 22, 

 23. 



Sutherland, Duke of, throwing 

 electric light on ceiling, 191. 



System, old, of testing insulation. 

 78. 



TABLES of absorption of water by 

 insulating materials, 101 ; (com,- 

 parative readings of deep sea 

 electrical and Miller-Casella ther- 

 mometers, 268, 269, 270 ; of elec- 

 trical resistance and platinum ball 

 thermometers, 150 ; of Wheatstonc 

 diagram and differential volta- 

 meter, 178, 179) ; electrical resist- 

 ance of platinum, 143, 147 ; (in- 

 creased electrical resistance with 

 increase of temperature of alumi- 

 nium, 156 ; copper, 154 ; iron, 155 ; 

 platinum, 151 153 ; silver, 157) ; 

 inductive and insulating power of 

 insulating materials, 67 ; specific 

 inductive power of gutta-percha 

 and india-rubber alone and com- 

 bined, 104 ; specific resistance of 

 gutta-percha and india-rubber 

 alone and combined at different 

 temperatures, 102, 103. 



Tangent galvanometer for small re- 

 sistances referred to, 121. 



TENSION. 



Telegraph cable, importance of 

 water-tight tanks for, 159; similar 

 to Leyden jar, 54 ; spontaneous 

 generation of heat in, 158. 



Telegraph messages, mutilated, 114. 



Telegraph poles, iron, 113 ; combine 

 lightness, strength, and conveni- 

 ence of construction, 129 ; last 

 longer than wooden, 131 ; light- 

 ness of, important, 136 ; stability 

 of, increased by base plate, 135 ; 

 stretching for corners, 136 ; suit- 

 able for tropical countrieLS, 132 ; 

 transportable easily in pieces, 135. 

 See Iron telegraph poles. 



Telegraph poles, Siemens's, C. W., 

 iron, 129 ; construction of, 130 ; 

 cost of, 131 ; erection of 180,000 

 in ten years to 1873, 131 ; height 

 and dimensions of various, 131 ; 

 proportion of thickness to diameter 

 of, 130 ; wrought-iron base-plate 

 for insuring steadiness, 130, and 

 comparison to tree, 135. 



Telegraph ship, great manoeuvring 

 power required in, 139. 



Telegraph by touch, Varley on, 44. 



Telegraph wires, machine for cover- 

 ing with india-rubber, 65. 



Telephone, with carbon contact, 

 Edison's, 197, 204. 



Telephone, phonograph, microphone, 

 separate steps in the achievement 

 of an advance in physical science, 

 197. 



Temperature, combustion, in fur- 

 naces limited by that of dissocia- 

 tion, 221 ; (.effect of, on insulation 

 of gutta-percha compounds, 104 ; 

 of telegraph cables, 158) ; (elec- 

 trical resistance, effect on, of, 142 ; 

 measurement of, by, 158) ; rise of, 

 in electric telegraph cables proved 

 by electric resistance thermome 

 ter, 158. 



Tension, diminution of, in cables, 

 56. 



