ELECTRICITY. 



i's eteetrenmer. 44 1 

 i, sftecfcorfinf. 435. .'..'0 



on light- 



Rooald'i thunder rod, 517 

 ooayive on atmospheric*; ttK- 



iru-ily. ** 

 Rouland'i silk electrical ma- 



chine. 514 

 Rubber, construction of, 509 



Jone*' ib. 

 Rupert's drop*, electricity of, 



467 

 Runel't hT|>thesi, 599 



8 



Saiuuure, experiment* of, 427 

 on the electricity pro- 

 duced by evapora- 

 tion, 463 



on the spontaneous 

 electricity of the 

 human body, 479 

 Sealing-wax spun into threads, 



434 

 eiclted by being 



broken,' 458 

 Separation of parts, electricity 



produced by, 467 

 Shaving* of wood, lcctricity 



of. 467 

 Ship*, method of defending 



them from lightning, 519 

 Shock, electric. 41, 435 



mechanical en"octsof,494 

 chemical effects of, 197 

 tnagnetical effects of, 



504 



Silk stockings, Symmer's expe- 

 riments on, 421 

 electrical machine, 514 

 Silurus electricus, properties of, 



479 



Geoflfroy on the ana- 

 tomy of, ib. 

 Singer's experiments on the c- 



lectric column, 471 

 experiments on the oxi- 

 dation of metals, 500 

 electrometer, 522 

 new system of insula- 

 tion, ib. 



experiments on the e- 

 Jectricity of powders, 

 469 



atmospherical appara- 

 tus, 517 



Skrimshire on the phosphores- 

 cent effects of electricity, 503 



Sfrfltnilnl't experiments on 



the torpedo, 474 

 Spark . . 437 54* 



Spiral lube luminous, 4S9 

 Spontaneous electricity of the 

 human body, 479 

 PlUSSllll'l experiment. 



on, 479 

 Hemmer's experiment* 



on, IMI 



St Elrae, fire of, 494 

 Stars, falling;, 494 

 Stockings, silk, experiments on, 



421 



Sulphur, experiment* on, 461 

 Swinden, Van, on the conduct- 

 ing power of powdered glass, 

 432 

 Summer's experiments, 4!t 



on the perforation of 



paper, 4'Ji 

 theory, 422 



f 



Table of electrics, 429 

 of conductors, 431 

 of the different electriri- 

 tie* produced by dif- 

 ferent bodies, 430 

 of nonconductors, 433 

 shewing the dissipation of 

 electricity by the con- 

 tact of air, 445 

 shewing the dissipation 

 of electricity along im- 

 perfect insulators, 448 

 respecting the distribu- 

 tion of electricity, 4.52 

 shewing the electricity 

 produced by the eva- 

 poration of water from 

 iron, 463 

 from copper, 464 

 from silver, 465 

 from porcelain, ib. 

 of alcohol from sil- 

 ver, 466 

 of ether from silver, 



466 



f powders that gave e- 

 Jectriclty by beingdrop- 

 ped, 468 



of the effects of the elec- 

 tric column, 471 

 of the electricity of the 

 atmosphere, 482, 485, 

 4b6 



of the heights of the au- 

 rora boiealis, 493 



Table of the velocities and 

 height* of fire ball*. 494 

 respecting the fusion uf 

 nut.iU by elcc' 



N 



of the result* obtained by 

 decomposing the gases, 

 40* 



of tlc phosph orescent ef- 

 fect* produced by elec- 

 tricity, 503 



Talc, electricity produced by se- 

 parating its plates, 448 

 battery made of, 520 

 Temperature, electricity pro- 

 duced by a change of, 456 

 Tetraodon eieclricu*, 479 

 Teylerian electrifying machine, 



12 



Theory of Cabscus. 418 

 Digby, ib. 

 Descartes, ib. 

 Boyle, ib. 

 Franklin, 416 

 Nollct, 418 

 Kllicott, in. 

 Symmer, 422 

 jKpinus, 424 

 Cavendish, 425, 529 

 Bussel. 528 

 Deluc. 529 

 two fluids, 545 

 Thunder, an electrical pheno- 

 menon, 487 

 bolt ascending, 490 

 rods, 517 

 storm, description of, 



490 



storm, curious pheno- 

 menon seen during, 

 491 



Topaz, electricity of. 459 

 Torpedo, electricity of, 472 



experiments of Walsh, 



473 



of Ingenhousz, ib. 

 of Humboldt and 

 Gay Lussuc, 474 

 of Spallanzaoi, 474 

 anatomy of, by Hun- 

 ter, it>. 



Cavendish's explana- 

 tion of its electrici- 

 ty, 476 

 artificial, Cavendish's, 



476 



Torsion balance, Coulomb's, 

 441 



Tourmalin, electrical prspertie* 



of, 456 

 Wataon'a experiments 



on it, 457 

 Canton's, ib. 

 Ilauy's, ib. 

 Priestley'*, 458 

 relation between it* po- 

 larity and secondary 

 form, 460 

 Trichiurus Indicus, properties 



of, 479 



Troostwyk, on the electricity 

 produced by molt- 

 ing resinous bodio. 

 462 



on the dccom)' 

 a f water, 501 



V 



Vegetables, effects of ci- 

 ty on, 507 



Vitiated air, electricity of, 491 

 Vwlta's discoveries, 426 

 condenser, 524 

 electrophorus, 515 

 hydrogen lamp, 53ft 

 electric pistol, ib. 



VY 



Wall's experiments, 412 

 Walsh's experiments on the tor- 

 pedo, 473 



Winckler's experiments, 415 

 Wincklcr introduces the cu- 

 shion, 509 

 Water, decomposition of, by 



electricity, 501 

 experiments of Warl- 



tirv. ib. 



do.ofWollaston.501 

 Watson's experiments, 415 

 Wheler's ex|>eriments, Ib. 

 Wilckc's experiments, 423 

 Wilson's, Benjamin, experi- 

 ments, 421 

 on the tourmalin, 



457 

 Wires, metallic, on the fusion 



of, 499 

 experiments of Brooke, 



ib. 



do. of Van Marum, ib. 

 do. of Cuthbertson, 500 

 do. of Kienmayer, ib. 

 shortened by electrici- 

 ty, 496 



Wolff's improved rubber, 513 

 Wolluston on the decomposi- 

 tion of water, 501 



Indr*. 



E L E 



ELECTUARY. See PHARMACY. 



ELEOIA, a genus of plants uf the class Dicecia, and 

 order Triandria. See BOTANY, p. 334. 



ELEGY. See POETRV. 



ELEMENTARY COMMA, in music (c), is an inter- 

 val, whose ratio has | , = 1 1 + m, and is the COM- 

 MA major. See that article. 



ELEMENTARY Semitone (S), the hemitone of Dr 

 Smith and others, (H), or minor second (2nd), is an 

 interval, whose ratio is -J.J, = 57 Z + f + ^ m - S* e 

 SEMITONK Major. 



ELEMENTS, in Music, are the intervals between 

 the adjacent notes of different scales, or systems of mu- 

 sical intervals: these are of several kinds, viz. 



Chromatic Elements of the donzeave, or system of 1 2 

 notes, which are the major, the medius, and the minor 



E L E 



semitones, S, S, and rf, (see Plate XXX. Vol. II.) ; and 

 the octave is made up of 7S + :i S + ; 2rf, = VIII. 

 Seethe I'hilo.w/>hical Magazine, vol. xxxix. p. tl*. 



Concordant Elements, or elements of harmony, are 

 the three smallest concords ; the minor fourth, and 

 major and minor third ; 4th -f. 1 1 1 -f. 3d = V 1 1 1 . See 

 COXCORD. 



Diatonic of the septave, or system of seven notes ; 

 these are the tones major and minor, and the semitone 

 major, T, t, and S in our notation ; T, t, and H in L)r 

 R. Smith's ; and G, L, and S in Mr Maxwell's notation : 

 here 3 T + 2t + 2 S = VI 1 1. See DIATONIC El< ments. 



Of Music, according to Chambers, are T, t, S, and 

 tf ; yet these four elements seem incapable of being all 

 combined together in one octave; but any three of 

 them, except T, S, and J, may ; and, in these cases. 



