452 



INDEX TO VOLUME II. 



BAKERIAN LECTURE. 



Bakerian lecture, on variation of 

 electrical resistance with tempera- 

 ture, 265. 



Bakewell's chemical electric tele- 

 graph, 1848, 18 ; chemical re- 

 cording instruments, 23. 



Baseplate to telegraph pole, extra 

 excavation not necessitated by, 

 133 ; load more equally divided 

 by, 136 ; stability increased by, 

 135 ; weight saved by, 135. 



Basse. See Earth's Conducting 

 power. 



Batteries, electro-motive force of, 

 variation of, 169. 



Battery power low for submarine 

 cables, 75. 



Bell, I. L., electrical resistance 

 pyrometer used by, 167. 



Bell insulator, with vulcanite stalk, 

 113. 



Bell's telephone and Hughes's micro- 

 phone, points of analogy between, 

 196. 



Berlin and Grossbeeren, underground 

 telegraph between, in 1847, 

 11, 22. 



Bolzani, Professor, electrical resis- 

 tance thermometer used by, 167. 



Bottom, nature of, as affecting cable 

 laying, 89. 



Brain action and phonograph, 

 analogy between, 197. 



Brake, loading of, by hydraulic 

 pressure, 116; power adjusted to 

 spring balance, 116 ; wheel, re- 

 taining force on, 138. 



Brett, proposal by, to protect insu- 

 lated wire with sheathing of iron 

 wire, 39 ; submarine telegraph 

 system of, reference to by 

 Smith, W., 39. 



Bright, telegraph arrangements of, 

 reference to, 23. 



Bright, Sir C. T., telegraph to India 

 and its extension, discussion of 

 paper by, 110 114. 



CABLE. 



British Association unit, determined 

 by Kohlrausch. 217. 



Brittle, J. R., dynamo-electric appa- 

 ratus, recent improvements in, 

 discussion of paper by, 187 193. 



Buff and Beetz, glass conductive of 

 electricity when slightly heated, 

 31. 



Bunsen, dissociation temperature 

 according to, 221, 222, 245. 



CABLE brought up from 1,500 

 fathoms' depth, 113 ; control of in 

 laying, maintained by mechanism, 

 14 ; hemp covering of, 119 ; de- 

 signed by Siemens, C. W., descrip- 

 tion of, 107 ; discharge of, 32 ; 

 faults in, determining position of 

 59 ; formulae for diminution of 

 tension in, 56, 57 ; grappling for 

 in Atlantic, 117; grappling for in 

 Mediterranean, 117 ; guiding and 

 delivery pulley for, 140 ; heated, 

 never returns to original insula- 

 tion, 84 ; heating of, 92 ; heavy 

 unsuitable for deep water, 106 ; 

 hemp, covering of, acting as 

 packing, 119 ; hemp of, eaten 

 away, and , gutta-percha indented 

 by marine insects, 118 ; inductive 

 capacity of, importance of know- 

 ing, 54 ; insulation and copper 

 resistance of, methods of ascer- 

 taining, 52, 53 ; laid over deep 

 valley in Mediterranean, 89, 90 ; 

 laying affected by nature of 

 bottom, 89 ; laying, S. S. Faraday's 

 appliances for, 137 ; life of, that 

 of outer covering, 111 ; lying on 

 uneven bottom, strains unequal 

 on, 118; passes from ship to 

 bottom in straight line, no cate- 

 nary formed, 138 ; path of, from 

 tanks to sea, 140 ; {paying out, 

 considerations in, 186 ; machinery 

 for, 114 ; retarding strain depends 



