Class X.]
INDEX.
i
Bayard. Sun-picturcs, public buildings of Paris ; calo-type of Venus and Cupid, 279.
Flacheron. Suu-pictures; excellences; accurate repre-sentation of superficial texture, 279.
Henri Le Secq. Calotypes ; evils arising from negli-gence in the adjustment of the camera, 279.
Eyekakd Blanquakt. Talbotype pictures; a newprocess by which one negative proof is made toaiford 200or 390 impressions; its partial success, 279.
Cousin. Talbotvpes, 279.
Albert. Sun-pictures, 279.
Chevalier. Photographic proofs, 279.
Mayer. Talbotype miniatures ; traces of the brush, 279.
Paul Pretscii. Photographic pictures from nature, 279.
Cioslng remarks upon the collection of photographs ; regret atthe exclusive nature of the present application of photo-graphy ; specification of those purposes to which it mightbe applied with effect and benefit ; absence of all specimensof scotography, 279.
MAGNETS, 279.
Remarks upon the improvement of steel magnets; attentionpaid by }harder to the permanent magnetic powers ofcast-iron, 2SO.
Dr. Scoresby's experiments upon the magnetic properties ofcast-iron; Dr. Scoresby's results , 2SO.
Mr. llearder s experiment upon the magnetic properties ofcast-iron , 2S0.
Logkman. Permanent magnets; results of experiments,280.
IIenley. Permanent magnets; results of experiments,280.
Shaw and Son. Two magnets, of 9 lb. and 76 lb. weightrespectively, 2S0.
IIeardek. Cast-iron magnet; its construction; obser-vations upon the relative powers of the magneticplates when separated; permanent horse-shoe steelmagnet; its weight and power, 280.
Rundell, Carbonized cast-iron magnet, 2S0.
MAGNETICAL INSTRUMENTS, 2S0.
Brooke. Photographic apparatus for the self-regis-tration of the magnets; description of apparatus;chemical solutions for the preparation of the paper,2S0.
Wilton. Fox’s dipping-needles, 281.
Parkes an i) Son*. Pocket compasses, 281.
Green. Magnetic sun-dials ; pocket compasses, 281.Veates. Prismatic compass, 281.
ELECTRICAL INSTRUMENTS, 281.
General remarks upon the necessity for an inexpensive instru-ment adapted for the observation of atmospheric electricity,281.
Application of steam-power to the production of electricity,
2S1.
Westmoreland. Gutta-percha electrical machine; de-scription, 2S1.
Remarks upon the application of gutta pcrcha. 232.
Watkins and IIill. Electrical machine; construction ;galvanometer; thermo-electromeUr, 282.
Duleuil. Electrical machine for medical purposes, 282.
Meinig, Ilydro-clectric chain batteries, 282.
Thermo-Electricity . Introductory remarks on results ofLubeck of Russia ’s discovery , in 1821, of electric currentsgenerated by contact of two different metals in heatedstate , 282.
Suss. Thermo-electric battery; construction,2S2.
Hoffmann and Eeeriiardt. ‘An apparatus for showingthe earth’s magnetism, 2S2.
Cuesswell. Electro-magnetic engine for the productionof motion, 233.
Froment. Llcctro-mognctic engine; its construction.283.
Breton. Electro-medical apparatus, with double cur-rent, 283.
IIjortii. Electro-magnetic engine; plan of improvedarrangement; detailed description of its action.283.
ELECTRIC TELEGRAPHS, 283.
Introduction ; Fine collection by Electric Telegraph Com-pany ; medic telegraph ; rapid progress ; Lesages pro-position in 1782; J.omond in 1787; Reizen; Saiva;Ronalds; Galvani; Volta; voltaic electricity, 283.
Soemmering's points; Coxes decompositions; Aragds an lFaradays discoveries; I'i.vii ; Saxton; essentials ofelectric telegraph; generation of the force; differentbatteries; lioito's proposition, 284.
The earth supplies electric force; means of setting the currentin motion; magneto-electric machine; insulation of theforce; Ronalds , Weber, Stcinheil , Walker, 235.
Use of caoutchouc; gutta pcrcha; insulation of strett andtunnel wires; those under rivers , or harbours; firsttelegraph communication between England and France ;diff erent methods for submarine wire, 285.
Utilization of the Force; different methods of makingthe force manifest, 2SG.
Galvanometer; Steinheil , Alexander, Schilling. Davy, Gaussand Weber, Fcchner, Mason, Cooke and IVheutstone,Jlighton, by whom the electro-magnet has been used .
me 7
236.
Different signals in France, England, Prussia, and America ,2S7.
Instruments exhibited by the Electric TelegraphCompany ; a rliomboidal needle, patent 1816, 287.
Wheatstone ’s magneto-electric induction machine, 2S7.
Hatcher’s magneto-electric induction machine, 287.
Wheatstone ’s rotating induction machine, 287.
Barlow’s printing telegraph, 287.
Nott and Gamble’s telegraph, 2SS.
Hatcher’s induced current machine, 233.
Cooke’s portable telegraph, 288.
Brett and Little’s conventional alphabet, 288.
Wheatstone and Cooke’s patent, 1840, 288.
Hatcher’s electro-magnet printing telegraph, 238.
Bain’s chemical printing telegraph, 2S8.
British Electric Telegraph Company, 288.
Higiiton’s different patents, 28S.
IlENLEY’smagncto-electric telegraph, 288.
J. Brett’s electric printing telegraph; description;arrangement of letter; pocket communicator; anelectric circuit regulator ; specimens of submarinewire, &c., 280.
Bain’s electro printing telegraph, 2. 0.
Bakewell’s copying electric telegraph, 290.
Walker’s mode of insulation of wires ; compound needie •bell transferrer; branch double turn-plate; light-ning conductor; graphite battery; moveable F.uds;ringing handle, 2. 0.
Allan’s needle telegraph, &c., 272.
Reuing’s electric telegraph, &c., 292.
Brett’s patent electric telegraph alarum-bell, 293.
Little suggests the use of a sewing needle, 2‘.;3.
Alexander’s electro-magnetic telegraph, 2. 3.
Smith’s comic electric telegraph, 2 j3.
McNair’s submarine wire, 2. 3.
Wiiisiiaw’s gutta-percha tubes, mcufch-piecce, hvdraulictelegraph, &c., 293.
Siemen’s and Halske 's telegraph, 2.’3.
Stohreu’s magneto-electric telegraph, 294.
APPLICATION OF ELECTRO-MAGNETISM TO THEMOVEMENT OF MACHIN ES, 232.
Remarks upon Professor Oersted's discovery , and the ap-plication of an active force produced without externalinfluence , to the movement of machines, 282.
Joule. Electro-magnet; estimate of magnetic forceobtained; surface electro-magnet, 232.
Harrison. Electro-magnetic engine ; principle of itsaction; constiuction, 282.
Knight and Son. Electro-magnetic engine; simple inconstruction; electrical machine; its construction.233.
\\ atxins and Hill. Electro-magnetic engine ; its prin-ciple and construction, 233.
Allen. Electro-magnetic railway-train alarm, 283.
DOMESTIC TELEGRAPHS, 294.
Burdett, Reid, Wiushaw, Brooks, Howland, 294.
CHEMICAL APPARATUS, 295.
General remarks, 2 5.
Knight and Sons. Chemical cabinet; furnace; dif-ferent batteries, 295.
Griffin. Glass instruments; system of assigning afixed volume to atomic weights, decimal wei&c., 295.
Edwards. Glass vessels covered by copper, 295.
Jbbetson. Blowing apparatus, 2.15*
Statiiam. Yaiicus boxes cf chemical tests. 2.-5.
Baker. Saccharometer and lactometer, 2..‘5.
CorruY. Chemical apparatus, 2. 5.