JNDEX TO VOLUME If. 



473 



SOLUBILITY OK GUTTA-PERCHA. 



Solubility of gutta-percha and india- 

 rubber in water, 109. 



Soundings, deep sea, not taken fre- 

 quently enough, 90. 



tic, inductive capacity of insu- 

 lating materials, permanency of, 

 54 ; of gutta-percha and india- 

 rubber, table of, 104. 



Specific resistance of gutta-percha 

 and india-rubber, table of, 102, 

 103. 



Spectrum, solar light, experiments 

 on plant growth in, 237, 240. 



Spiral iron sheathing, 44. 



Spontaneous heating of cables, 92, 



Static electric telegraph, Reiser, 17 ; 

 Salva, Dr., 17. 



Stationary steam-engine and locomo- 

 tive steam-engine, comparison of, 

 265. 



Steam-engine, waste heat from, 

 applied to hot-houses in electrical 

 horticulture, 247. 



Steam and electric tramway com- 

 pared, 265. 



Steinheil, electric telegraph referred 

 to by Pearsall, 43 ; magneto-elec- 

 tric telegraph instruments of, 19 ; 

 re-discovery of earth's conducting 

 power by, 19, 20. 



Stewart, Colonel P., worthy of high 

 eulogium, 111. 



Stcehrer, dial instruments of, 23. 



Stokes, G. G., on refrangible invisi- 

 ble rays in electric arc, 255. 



Stotherd, Maj., explosives, electrical 

 ignition of , discussion of paper by, 

 127128. 



Sturgeon's extension of electro- 

 magnetism, 18. 



Subdivision of electric light, 200. 



Submarine electric telegraph cable, 

 11 ; balanced, 27 ; casualties to 

 which liable,138 ; charging of , time 

 required for, 30 ; (committee on, 

 experimental researches for, 'JO ; 



8UBMARINE 'I 1.1.1:1.1: \ I'll CABLE. 



record of past experience by, 90) ; 

 (i-n/iih/etiir of, aluminium suitable 

 for, 15, 28 ; copper, pore, 15, 28, 

 65, 66 ; insulating covering and 

 sheathing of, 14, 65) ; construc- 

 tion of, report of joint committee 

 on, 90 ; destruction of, by marine 

 insects. 118 ; (fleet rical condition 

 of, 27, 29 ; principles and practice 

 involved in dealing with, 47) ; 

 electro-motive force limited in, 

 13 ; failures due to decrease of 

 insulation of, 47; (faults in, 

 affected by earth currents, 183 ; 

 place of, methods of determining, 

 59, 98) ; first, 12 ; importance of 

 water tanks on board ship for, 

 117 ; increasing capability oF, 

 means of, 35 ; (insulating covering 

 of, 15, 28, 65, 66 ; most essential 

 part of, 66) ; insulating and pro- 

 tecting, 90 ; a Leyden jar of gutta- 

 percha,conductor for inner, sheath- 

 ing for outer metallic coating, 29 ; 

 lightness, with permanent strength 

 of, 14, 28, 111 ; manner of descent 

 into water, 83 ; many questions 

 involved in, 14 ; mechanical pro- 

 blem of construction and submerg- 

 ing, 11, 27 ; necessity for strength 

 of, 38 ; rate of telegraphing 

 through, 13 ; retarding force on 

 paying-out brake, and strength of, 

 to resist, 27 ; (sheathing of, 65 ; 

 must give strength, 15, 28, 65 ; 

 of soft steel wire for, 15, 28) ; 

 shipped from the Thames, almost 

 all now working, 183 ; (Siemens' s, 

 Werner , method of determining 

 position of fault in, 183 ; and 

 Siemens, C. W., paper on submerg- 

 ing and testing, 183 ; paying-out 

 apparatus for, 14) ; size of con- 

 ductor and thickness of insulating 

 covering for, 91 ; small specific 

 weight and great tensile strength 

 of, 27 ; success of, depending on 



