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•^"NATURAL PHILOSOPHY AND EXPERIMENTAL PHYSICS— Continued. r lV , ' MVolta's oon dsnsing electroscope. 168 nectridty developed bj e h s mh al N' Laid)tonberg's figure*, distribution at tiro 159 Crown of cup*. PT kinds ol oloctricity. 160 Cruiok shank's trco^. W LelahUnberg's figures, distribution ot pot- 161 Wollaston - * mIL <- Itlva electricity 169 Wollaston's battery. .Ill LeiohUnberg’s figures, distribution ot nag- 168 Bare’s dsfiagratoc. stirs else trinity. 164 DanleU’s cell 199 Duration ol spark, Wheatstone’s revolving 168 Orove’e eelL mirror. 169 Bunsen’s cell. US Duration ol spark, theory of revolving mirror 197 Bunsen's battary ot fire element*. 794 Diagram ot Peaderven’a experiment to 108 Rectangular tine and carbon battery, measure duration of spark. 169 Calian's battery. GaaeL, 098. 1M Loose * Casin'* else trio chronosoope. Ganot, 697. 107 Reiss' spnrk micrometer. us nmura . umuw »v»ii 198 Reiss' sloe trio spark air-thermometer. 178 Deoom position of water by rolUls battery. 109 Bomhaidt'e electric machine lor exploding 174 Explosion of torpedoes by sleotridty. mines. Osn. Cbasal's system ol aslsnca. Ill Ton K bn si's slsctrio maohlns tor exploding 178 Bichromate ol potash battery- lor blaattag Hnt mines. Ill Abel's electric fuse. Oanot 614-915. 176 Btatham'a fuse lor exploding, and chambers Ul Colon si 8chsw*s apparatus lor blasting. la mines. Ill Thompson’s needle quadrant electrometer. * 177 Tunnels and preparatory works lor blowing Oanot, 6181 np Hell Gate rock, New Tork. 116 A storm on tbs Pyramids. 178 Blowing np ol Bell Gate rock, and (UagTams IU Different kinds of lightning. ol apparatus. Ul Tbs PI re of 8L Elmo. 17* Formation of metallic magnesium fan ■ lit Electric Aureola. tobaooa pipe. 118 Photographic reproduction of electric spark 180 Decomposition ol salt*. Ill Different kinds of lightning. Ul The Fire of 8t Elmo, lif Electric Aureola. Ul Photographic reproduction of else trio spark Ul Globular Lightning sou* and sketched by H. Colon. 190 Globular Lightning 191 Formstinn ot marlrw Waterspouts. 199 Ballon firing at a Waterspout 199 Tank struck byLlghtnlng at Montmartre, *69 194 Tree scarified by lightning In the forest ol Balnt Germain. 198 M. Lancon struck by lightning. 198 Electrified Tree. 197 Prevention of Hall-storm*. 199 lightning above a Volcano. by current, and Grothua’s hypothesis Oanot, 669, 670. Ill Grove’s gas battery. 184 Faraday s experiment In sUetanl ys i a « Ganot, 67JL 188 Mechanical action of a currant, Ganot, 888 110 Bell-ringer struck by Lightning. 181 lightning attracted by Metallic lodes. 199 Umbrella and lightning conductor. Comic !M Explosion of Gas. 187 Miners struck by lightning. Ill Lightning passing down a staircase. 1M Franklin's Kite experiment 148 Oak struck by lightning at Wimbledon Perk >■ 1U Vertical rod of lightning sonductor and gilded ooppsr point U9 Fixing lightning oondneton, vertical and oblique rode. Ill limits of protection of a system of Lightning eonductore on s building. 146 lightning oonductor with multiple points. 1*8 Baussure's atmospheric electrometer. -'Ganot, 81L III Aunts Borealis In the Arctic regions. ■£/ 167 Aurora Borealis seen In the Atlantia oessn, August 9th, 1849. 1*8 Radiating and Curtain Aunts. i ]V> 149 Galvanl's frog’s leg experiment '• 189 Gal rani’s experiment on Induction. Ill Galvanl’s researches with contest of metal*. Ul Galvanl's experiments on animal electricity. Ul Repetition of Galvanl’s experiment with a frog's legs . 1M Voltaic eleiront Ganot, 8M. (68 Voltaic plls ?!:- 168 Zambou’s p41e, Electric perpetual motion, lit Pile eieotranstar. ■ 187 Simple apparatus for electro-plating. 188 Compound apparatus for electro-typing. 189 Electro-typing objects In the round. The mould and finished objoct mould and finished objoct 199 Compound apparatus for gold and stives aleotro-plaung 191 Roaelaur'e balance Cor gold and stives electro-plating, lit Oersted’s experiment 199 Amp*re’s law. 194 Deviation to the left of the vertical entrant 196 Bchwelgger's multiplier. Diagram. 196 Behweigger'a multiplier and.sabaticineedles Diagram. Ganot. 944, 846. »■' 197 Bystem of two astatic needles. Diagram. 198 HobiU'a astatic galvanometer. V. 901 Thomson's marine galvanometer. Oanot 647 991 Meissner's and Usyerstetn’s mirror galvan- ometer. 199 Weber’s tangent galvanometer. 904 Bins galvanometer. 906 Blemen’s and Halske's sine galvanometer. ; 906 Ohm’s law., various ways d connecting batteries. 907 Wheats tone’s Rheostat 908 Pogrendorffa RLeoootd. 909 Reeistanee Plla 919 Resistance measured fay PoggeaderiT* eaa» pensation method. 918 Resistance of liquid a Wheat* Urns'* apparatus 914 Resistance of liquids. Been utter* apparatus, 118 Resistant* of Uquida Hereford's and an improved trough. OPTICAL LANTERN'S. Any customer desiring information about Lanterns, or advice aa to what Lantern / to purchase, is invited to write to us, when we shall be happy to place our experience - at his disposal and ensure his obtaining the result he desires.