INDEX TO VOLUME II. 



ELECTRICITY. 



A. B. C. INSTRUMENT. 



A. B. C. or dial instrument, action of, 4 ; 

 automatic, 5 ; description of, 3, 4 ; 

 manipulation of, 4 ; used by Ger- 

 man telegraph department, 5. 



Absorption of water by insulating 

 materials, 100 ; pressure to 50 Ibs. 

 does not affect, 100 ; more rapid 

 in pure than in salt water, 100 ; 

 temperature, effect of, on, 101. 



Accumulative action of dynamo- 

 electric machine, 120. 



Acoustic telegraph, Varley's, 44. 



Additional coil galvanometer, method 

 of using, 52. 



Adley, C. C., electric telegraph, 

 history, theory, &c., of, discussion 

 of paper by, 5 11. 



Agassiz, Professor, proposal to use 

 Siemens's deep-sea electrical 

 thermometer, 266. 



Aldini. Sec Earth's conducting 

 power. 



Alexander's magneto-electric mul- 

 tiple needle telegraph, 18. 



Alexandria and Benghazi cable, 

 fault in, due to, 96. 



Alteneck, von H., dynamo-electric 

 machine, advantages of, 215 ; 

 description of, 215. 



Alternating and continuous currents 

 compared, 200. 



Alternating currents necessary with 

 electric candle, 191. 



Aluminium, increase of electric 

 resistance with temperature, table 

 of, 133. 



BAIN. 



Ampere on electro-magnetism, 18 ; 

 first electro-magnetic multiple 

 needle telegraph, 18. 



Arago on electro-magnetism, 18. 



Argyll, Duke of, microphone ap- 

 plicable to physiological research, 

 197. 



Armature of H section, with wire 

 coiled in recesses, rotating close 

 to magnets produced quantitative 

 induced currents, 45. 



Arndsten's experiments on effect of 

 temperature on electric resistance, 

 142. 



Atlantic not infested with insects 

 preying on cables, 118. 



Atlantic and Mediterranean, differ- 

 ence of bottom of, 117. 



Atlantic cable, consists of, 138 ; 

 paying out and picking up ma- 

 chinery for, 114 ; projected, refer- 

 ence to, 13 ; requirements of, little 

 known, 91 ; water tanks for hold- 

 ing, in Oreat Eastern, 117. 



Atmospheric and subterranean 

 temperatures measurable with 

 electrical resistance thermometer, 

 162. 



Atmospheric electricity, local dis- 

 tribution of, 128. 



BAIN'S chemical electric telegraph, 

 1843, 18, 37 ; chemical recording 

 instruments, 23. 



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