Kingdom.] AND SURGICAL INSTRUMENTS. 435
_ North, North Central, and South Central Galleries.
paintings and apparatus, showing the method of producingJ lQ light, the arrangement of the lenses, and contrivance0l ’dissolving the pictures.
Gxyhydrogen microscope and apparatus, in case.
daguerreotype apparatus, consisting of an adjusting’ack camera, with compound achromatic lens, an im-proved bromine and iodine box, with contrivance forl ansferring the prepared plate to the frame of the camera,jaercury box, plate-box, chemical-chest, buffs, plate-n( >lders, gilding stand, tripod, &c. The parts of thea Pparatus are so arranged that the process may be entirelyPerformed in the light, without the necessity of a dark
Registered portable folding calotype camera , with achro-matic lenses, for portraits and views, &c.
. improved reversing frame, for producing positivePmtures from calotype negatives and other photogenicProcesses.
Registered improved agricultural drainage-level.
Balance galvanometer, for indicating the strength ofgalvanic currents in grain weights.
‘ Optometer/’ an instrument for ascertaining the exist-ence of any defect in the refracting media of the eye,and for determining the range of adjustment for distances"mich it possesses.
Patent electric indicator, for fire and thieves.
* 1 aiming rule, comprising the chief scales requiredy architects and surveyors, with a peculiar arrange-ment of the odd and even scales, and reading from thee <%es. fe
Chemico-mechanical voltaic battery.
Registering hygrometer.
Rust of Napoleon Bonaparte , from a model by Canova,executed by the electrotype process.
Similar bust of Sir Walter Scott , from a model by^eantrey.
Transparency, exhibiting the appearance of the lunarr* Sc when in direct opposition to the sun, as seen throughGerschel’s 40 feet reflecting telescope.
^33 Graham, George, 8 Liverpool Street , Walworth—Inventor.
Invention for directing an aerial machine.
34 Gilbert, G. Moubray, Ealing —Proprietor.
J atent portable celestial and terrestrial globes, inflatedlt h atmospheric air, manufactured of superior tissue1 a per. The celestial globe is particularly adapted for theSe of lecturers on astronomy: a view of the stars in their’imposition may he thus obtained.
A he terrestrial globe is inflated by means of an air-A mp, or si m pi e movement of the hand.
[A view of the stars in their true position relatively toe ach other and to the observer, can only be obtained byPlacing the eye inside of the celestial globe at its centre.A view of the countries of the earth in their true positionc an only be obtained by placing the eye outside of the ter-r ®strial globe, at an infinite distance: but this being im-^ s sibl e , the greater the distance, the more accurate istJ m view.]
Gharvolant, or carriage drawn by kites.
Oo F7
‘ Ldntley, John, New Broad Street Court —
M Inventor and. Manufacturer.
re gist // a self-propelling rotary balloon. Provisionally
Wens of engraving by the ruling machine, corn-line c * rcu l ar > elliptical, spiral, straight, and graduatedboivi' P es igned to prevent fraudulent imitation; with aaer ln chromo-lithography.
Pritchard, Andrew, 162 Fleet Street —Inventor and Manufacturer.
11 achromatic microscope.
249 Hett, Alexander, 24 Bridge St., Southwark—Preparer.
Variety of injected microscopic objects, showing theapplication of this mode of preparation, for displayingthe structure of parts and organs, and also serving to illus-trate the utility and importance of the microscope in itsapplication to the sciences of physiology and pathology.
Microscope to exhibit the objects.
[The injection of coloured substances into the minutervessels of the animal frame is an art peculiar and difficult.Leuwenhoek succeeded perhaps better than any previous,and the majority of subsequent, observers, in preparingminute injections, many of which are still preserved asprecious relics by the lioyal Society. The injections em-ployed consist of substances fluid when warm, and partiallysolidifying when cold. The apparatus employed is apowerful pump, the taper nozzle-piece of which is insertedinto an artery.—R. E.]
250 Field, Robert, & Son, 113 New Street, Birmingham— Manufacturers.
Large and small achromatic microscopes, with move-able stage.
Dissecting microscope, with Wollaston’s doublets.
Compound achromatic lenses for photographic pur-poses.
Calotype pictures; scene: Forest of Arden, Warwick-shire; staircase, Haddon Hall, Derbyshire ; and WychElm, Packington churchyard, Warwickshire .
[The calotype picture is a negative one, in which thelights of nature are represented by shades; but copiesfrom them can readily be made in which the lights areconformable to nature.—J. G.]
252 Poulton, Cornelius, Southern Hill, Beading —Manufacturer.
Objects prepared and mounted for the.mic.roscope, withillustrative drawings by Mr. M. S. Legg.
253 Smith, James, & Beck, Richard, 6 ColemanStreet —Manufacturers.
Glass case ; in the top, are stands for compound achro-matic microscopes, constructed so as to avoid tremor,with adjustments and complete apparatus. In the middle,are the requisites for mounting microscopic objects, thecells, slips, thin glass, fluid covers, See., and a few prepa-rations as specimens. The bottom is a new form ofcabinet for the objects.
Two tables, with revolving tops, for successively turn-ing the microscope to two or three persons who can con-veniently sit round.
[A compound achromatic microscope consists of twoor more combinations of lenses, by one of which an en-larged image of the object is formed, and by means ofthe other, or eye-glass, a magnified representation of theenlarged image is seen.]
254 Ross, A., 2 Featherstone Buildings, Holborn —Inventor and Manufacturer.
Astronomical telescope, the diameter of the object-glass is llj inches, mounted on a stand, with equatorialmovements and complete adjustments. The optical partwrought by Ross’s improved system and machinery.
This instrument is exhibited in the Western Nave.
[The grinding of an object-glass of 11-J inches in dia-meter to a good figure, and free from both spherical andchromatic aberration, is very difficult. The advantageof a large object-glass will be seen from the followingconsideration. The principal reason of the superior dis-tinctness of a telescope over unassisted vision arisesfrom the fact, that the pupil of the eye takes in a certain
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