[ 317 ]
IXDEX TO CLASS X.
Note. —This Report being so extensive, and embracing a large variety of subjects, it has been deemed by the Author expedient to prepare
a special Index to accompany it.
Introduction, 243.
Subjects included in Class X ., 243.
Astronomical Instruments, their construction and workman-ship* 243.
Electro-magnetism, its application to the simultaneous re-qistraliun of astronomical observations , 243.
Nautical and Surveying Instruments, 243.
Optics ; improvement of optical glass; microscopes; physicaloptics ; lenses and prisms , 243.
Photographic Cameras, and their improvement, 243.Photography; its utility; future imjx>rtancc; present im-provement as illustrated by the Exhibition ; in connectionwith art , as applied to the purposes of illustration; itsapplication to science ; to astronomy ; to the self-registrationof natural phenomena; to literature , 243.
Photographs of America, France , England; their charac-teristics , 244.
31. JIartens calotypes ; Claude?$ improvements; Ross andThomson's new process, 244, 245.
Positives on glass; probable causes of rapid advance ofphotography , 245.
The late M. Daguerre, 245.
Electric Telegraphs, 245.
Magneto-Electricity, 245.
Electrotype application of Voltaic action, 245.
Chemistry and Chemical Apparatus, 246.
Fire Annihilators, 246.
Plantmeters, 24G.
Air-pumps, 246.
Standard Measures of Length, 246.
Calculating Machines, 246.
Injurious Effect of Patents, how exemplified, 246.Classification of the Report, 246.
Probable Omissions, 246.
ASTRONOMICAL INSTRUMENTS, 246.
Probable cause of the omission of large instruments, 246.Excellent workmanship, 246.
Avoidance of unnecessary screw connections , 246.j). lr. Si/nm’s improvements , 246.
Workmanship of the German instruments, 246.
The process of dividing by hand objectionable , 246.Superseded by machinery ; the advantages oj the latter method ;
graduation of the Wcstbury circle , 246.
Mr. Bond’s electro-magnetic apparatus, 246.
Dollond . Variation transit instrument, 246.
Simms. Transit instrument; its object-glass; conversionof the axis into a telescope; adjustments; eye-pieces,247.
Simms. Diagonal transit; mode of illumination, 247.Gerard. Field transit instrument; its construction, 247.Dollond . Double altitude instrument, 247.
Simms. Transit circle; its graduations; supports; illu-mination, and its advantages, 24S.
Ross. Large equatorial; dimensions; support; con-struction, 248.
Simms. Equatorial; its dimensions, &c., 249.
Simms. A small equatorial, without clock motion, 249.Dollond . Portable equatorial, 249.
Simms. Westbury circle: graduation; microscopes;axis; object-glass, 249.
Simms. Altitude and azimuth instrument; its construc-tion ; adjustment and novelty, 250.
Crickett. Model of an equatorial stand, 250.
Ertel and Sons. Universal instrument; particularsof its construction ; new application of its clamps;object of the designer; its successful attainment,250.
Professor Miller’s remarks on application of clamps atthe centre, &c., 250.
Merz. An equatorial; its telescope and workmanship ;tests to which the telescope was subjected, 251.
Bond. Apparatus for recording transit observations bymeans of the touch ; its principles explained, 251.
NAUTICAL INSTRUMENTS; their number and re-spective merits, 252.
NAUTICAL ASTRONOMICAL INSTRUMENTS, 252.Simms. Troughton’s reflecting circle, 252.
Simms. Troughton’s sextant, 252.
Barrett. Sextants, 252.
Crichton. Sextants, 252.
Elliott and Sons; Watkins and Hill; Dixey. Sex-tants, 252.
Molteni and Siegler. Sextants and reflecting circles,
252.
Yedy. A reflecting circle; improvements by CaptainRichards ; several sextants, 252.
Buron. Sextants and octants, 252.
Beaulieu. Sextants, 252.
Oertling. Sextants, 252.
Imperial Ijorsk Works. Two large sextants, 252.Ashe. An instrument for great circle sailing, 252.
VARIOUS NAUTICAL INSTRUMENTS, 252.
Ericsson. A sea-lead; description, 252.
Ericsson. An instrument for determining distances atsea; description, 253.
Keller. A double planisphere, 253.
St. John. Detector compass ; aquatic velocimeter, 253.
SURVEYING INSTRUMENTS, 253.
Introductory remarks; comparison of respective excellences,
253.
SURVEYING AND LEVELLING INSTRUMENTS,253.
Simms. Transit theodolite; application; dimensions,power, &c., 253.
Dollond . Transit theodolite ; description; illuminationof the lines, 253.
Yeates. Portable theodolite; theodolite; prismaticcompass; optic square ; workmanship, 253.
Mark att. Theodolite ; construction to avoid flexure,
253.
Elliott and Sons. Altitude and azimuth instruments ;construction; theodolite; levels; adjustments; in-struments for the determination of distances, 254.Bridges. Instrument for the determination of distances;
rules and conditions for its use, 254.
Barton. Instrument for sketching ; object of its design,
254.
Liddell. Sights; levels; construction, 254.
Adcock. Drawing-machine, 254.
Cox. Beam draining level; construction and use, 254.Blytii. Levels, 254.
Dobbs. Spirit level, 254.
Horne, Tiiorntiiwaite, and Wood. Spirit level ; U3Cand adaptation, 254.
Denton. Draining levels, 254.^
Wilton. Miner ’s theodolite, 254.
Buron. Theodolite ; dimensions; levelling instruments,254.
Beaulieu. Theodolite , similar to Gambey’s dimensions,and adaptation: workmanship, 254.
Groetaers. An instrument for determining distances,254.
De Hexnault. Miner ’s compass, 254.
Lambert. Miner ’s compass, 254.
Becker. Levelling apparatus, 254.