I . 



INDEX TO VOL. I. [MAOJU.TISM A.N 



Liclit tod luagneiUm, rtlaliuni of ray of 



polarised. 271. 

 Lightning conductor* for telegraph poles, 



Lightning, its action on the needles of the 



telegraph, 868. 

 Locdttooe, the, 84S. 



Longitude ind the teiccraj'li, 2*0. 

 Luminous effects of induced currenti from 

 Rhumkorf * coil, 256. 



MACHINE*, various form* of magneto- 

 elect rir, 213, 253. 

 Magnetic tttnction, 244. 

 Magnetic attraction, theories of, 215. 

 Magnetic curves, 245. 

 Magnetic influence, of the aurora borealis, 



145. 



Magnetic needle, divergence of by electri- 

 city. 247, 259. 



Magnetic needle, variations of the, 245. 

 Mignetic needle, various uses of the, 243. 

 Magnetic polarity, 243, 244. 

 Magnetic poles of the earth, 245. 

 Magnetic properties of metals, 244. 

 Magnetic repulsion, 244. 

 Magnetism, 243 246. 

 Magnetism, accidental, 245. 

 Magnetism, action of, on a ray of polarised 



l.clit. 271. 

 MirfTtetism and electricity, mutual relation 



<>f, 257. 



Mijwrtitm and light, relations of, 271. 

 Magnetism and soft iron, 243. 

 Magnetism and steel, 243. 

 Magnetism a radial force, 244. 

 Magnetism, familiar instances of its 



presence, 245. 

 Magnetism in its relations to iron, steel, 



&c., 243. 



Magnetism, laws of the intensity of, 244. 

 Magnetism of iron induced by an electric 



current, 249. 

 Magnetism of a freely suspended electrified 



wire, 248. 



Magnetism of the earth, 245. 

 Magnetism, residuary. 249. 

 Magnet, lines of polar force in a, 271. 

 Magneto-electric induction, 257. 

 Magneto-elcctric-light machine, Holmes', 



858. 



Magneto-electric machines, 213, 258. 

 Magneto-electric machine, chemical and 



other effects of the, 258. 

 Magneto-electric machine, plating, &c., 



by the, 213, 258. 

 Magneto-electric spark, 258. 

 Magneto-electric telegraph, the, 2G8. 

 Magnet, poles of a, 244. 

 Magnets, artificial, 243. 

 Magnets, bar, 244. 

 Magnets, compound, 244. 

 Magnets, electro, 249. 

 Magnets, horse-shoe, 241. - 

 Magnets, how to make, 244. 

 Magnets, keepers of, 211. 

 Magnets, natural, 243. 

 Magnets, relay, 2C8. 

 Malta and Alexandria cable, 264. 

 Mariner's compass, the, 245. 

 Medical uses of the coil-machine, 255. 

 Mediterranean cable, 2C4. 

 Messages, telegraphic, mode of sending, 



259, 261. 

 Meteorology, nsrs of the telegraph in 



connection with, 269. 

 Moisture, its effects on the currents of the 



telegraphic battery, 2C2. 

 Mone's telegraph, 2G8. 

 Motion and dia-magneti'm, 271. 

 Motive power of electricity, 251. 

 Music printed, as composed, by electricity, 



266. 



KATDBAL magnets, 243. 



Needle affected by earth. eurrrnU, 262. 

 Needle affected by electric currents, 247. 

 Needle, dipping, the, 245. 

 Net die, diurnal variation of the, 245. 

 Needle, divergence of, by an electric 



current, 247, 259. 



Needle, eflVcts of fog, &c., on the, 246. 

 Needle, single and double telegraph, 



201. 



Needle, solar action on the, 245. 

 Needle telegraphic alphabet, 261. 

 Needle telegraph, simple form of a, 259. 

 Needles affected by atmospheric electricity, 



262. 

 Nickel, magnetic properties of, 245. 



OF.KSTFD'S discovery of the principle of the 



electric telegraph, 259. 

 Oscillation of the magnetic needle, 244. 



PKRMAXF.NT magnetism of steel, 243. 

 Photographic reuHstration of magnetic 



observations, 246. 

 Physiological effects of induced currents, 



254, 257. 



Polar force, lines of, in a mngnet, 271. 

 Polarised* light in its relations to the 



magnetic force, 271. 

 Polarity, magnetic, 243. 

 Polarity of an electrified wire, 248. 

 Polarity of needles sometimes reversed by 



atmospheric electricity, 262. 

 Poles, magnetic, of the earth, 215. 

 Poles of a magnet, 214. 

 Primary and secondary coils, 253. 

 Printing-telegraphs, 266. 

 Private telegraph, Wheatstonc's, 273. 



QUANTITY of electric cuirents necessary 

 for magnetisation, 250. 



RED SEA cable, 264. 



Registration, magnetic, by photography, 



246. 



Relay magnets, 263. 

 Repulsion and attraction exhibited by a 



RlmmkorPs coil, 256. 

 Repulsion, magnetic, 244. 

 Residuary magnetism, 249. 

 Resistance of copper wire to the passage 



of a current, 250. 

 Resistance thermometer, Siemen'a electric, 



274. 



Rhumkorfs coil, 255. 

 Rhumkorf a coil, experiments with, 25J, 



ft nq. 

 Rottenness of copper wire, 264. 



SECONDARY and primary coils, 253. 

 Secondary electro-magnetic induction, 



253. 

 Secret telegraphy, Allan's method of 



carrying on, 271. 



Ships'-compasscs, adjustment of, 246. 

 Ships'-compasses, errors, &c., of, 246. 

 Shipwrecks arising from defective com- 

 passes, 246. 

 Shock from Rhumkorfs coil, dangerous 



nature of a, 255, 257. 

 Shocks from telegraph wires impossible, 



262. 



Shocks from the coil-machine, 254. 

 Shore-ends of cables, 264. 

 Siemen's electric-resistance thermometer, 



274. 



Signals, FiUroy's storm, 270. 

 Signals, special telegraphic, 261. 

 tingle-needle telegraphs, 261. 

 Spark, chemical effects, &c., of induced 



currents, 255. 



Spark from Rhumkorfs coil, 255. 

 Spark from Rhumkorfs coil in a vacuum, 



256. 

 Spark from Rhumkorf * coil in ether, Ac., 



256. 



.n transmitting telegraphic message*, 



26). 



Steam-vessels, compasses of, 246. 

 Steel and magnetism, 243. 

 Steel, magnetisation of by an electric 



current, 249. 



Steel, permanent magnetic quality of, 243. 

 Steel, permanent magnetisation of by 



licity, 249. 

 Submarine cables (see, also, names of 



each station), 264. 

 Submarine cables, Allan's, 272. 

 Submarine cables, construction, &c., of, 



263. 

 Submarine cables, effects of earth-currents 



on, 266. 

 Submarine cables, hindrances in working, 



265. 

 Submarine cables, induced currents in, 



265. 

 Submarine cables, resistance and induction 



in, 265. 



Submarine telegraphy, 263. 

 Submarine telegraphy, difficulties in, 263. 

 Submersion of a submarine cable, 265. 

 Sun, action of, on the needle, 245. 



TELEGRAPH, Allan's, 271. 



Telegraph, alphabetical, 209. 



Telegraph and longitude, 270. 



Telegraph and meteorology, 269. 



Telegraph, Bakewell's copying, 267. 



Telegraph, balloon-electric, 274. 



Telegraph, double needle, 261. 



Telegraph, electric, 259. 



Telegraph, Froment's alphabetical, 269. 



Telegraph, magneto-electric, 268. 



Telegraph, Morse's, 268. 



Telegraph, printing, 266. 



Telegraph, single needle, 261. 



Telegraph, Tyer's train. 273. 



Telegraph, Wheatstone's alphabetical, 



269. 



Telegraph, Wheatstone's private, 273. 

 Telegraphic alarm-bell, 261. 

 Telegraphic alphabet, needle, 261. 

 Telegraphic messages, mode of sending, 



261. 

 Telegraphic messages, speed in trans- 



mi'sion of, 261. 



Telegraphic systems, American, 268. 

 Telegraphy, Allan's mode of carrying on 



secret, 271. 



Telegraphy, early methods of, 259. 

 Telegraphy, submarine, 263. 

 Time-bulls, electric, 270. 

 Train telegraph, Tyer's, 273. 

 Tver's train telegraph, 273. 



VACUUM, spark in a, from Rhumkorfs 



coil, 256. 



Variation, diurnal, of the needle, 245. 

 Variution of the magnetic needle, 215. 

 Varna and Balaclava cable, 261. 

 Varna and Constantinople cable, 261. 



. iron, influence of, on the magnetic 



needle, 246. 

 Voltaic batteries (See p. 1223). 



WEATHER report', telegraphic, 269. 

 Wheat-tone's alphabetical telegraphs, 



269. . 

 Wheatstnne'i private, commercial, and 



crnrrnl telegraph, 273. 

 Wlntehouse's method of printing music by 



ii.-ity, 266. 

 Wires, influence of the quality of, on the 



passage of electric currents, 250. 

 Wnr.s length, area, &c., of, in relation to 



i-lei-trir rurrenlM, 250. 

 Wires of submarine cables, 264. 

 Wires, resistance to the passage of an 



electric current, 250. 

 Wires, telegraphic, mode of suspending 



and insulating, 261. 



