438
[United
Individuals exist in this metropolis whose sole occupa-tion consists in painting the minute scenes or sliders usedfor the phantasmagoria lanterns. The perfection to whichthese paintings are brought is surprising. There are twomethods by which the sliders now employed are produced.In one of these, the outline and detail are entirely thework of the artist’s pencil. For pictures representinglandscapes, or wherever a spirited painting is required,this is the exclusive method employed. The colours arerendered transparent by being ground in Canada balsamand mixed with varnish. The other method is a transferprocess. The outlines of the subjects are engraved oncopper plates, and the impression is received from theseon thin sheets of glue, and is then transferred to a plateof glass, the impression being burnt in the same manneras is effected in earthenware. Sliders produced in thisway receive the distinctive name of copper-plate sliders.The subject is merely represented in outline, it being leftto the artist to fill up with the necessary tints, &c. Theadvantages of this method for the production of paintingsof a limited kind are obvious. Latterly photography onglass has been employed to obtain pictures for the magiclantern.—R. E.]
271 Dixey, C. W., 3 New Bond Street —Manufacturer.
Carved oak barometer. Barometer showing the actionof the mercury. Improved nautical sextant. Assortmentof spectacles. Eye-glasses. Binocular opera-glasses.Thermometers. Registered thermometers. Telescopes.Mathematical drawing instruments. Ivory rolling parallelrule (fully divided).
276 Clark, F., 13 Park Side, Knightsbridge —Inventorand Manufacturer.
Newly-invented adjusting spectacles and opera-glasses-
278 Hyams, Hyam, 59 Cornhill —Inventor and
Manufacturer.
New object-glass, acting as a telescope or opera-glass*and consisting of only a single piece of glass or lens, in theshape of a truncated cone, having a convex surface at thebase or large end, and a concave surface at the other.Improved Stanhope lens of a conical shape.
279 Weaber, Henry, 129 Oxford Street —Manufacturer-Invisible steel spectacles; gold spectacles, and a variety
of other spectacles, and hand-glasses.
280 Whitehouse, Nathaniel, 2 Cranboum Street
—Proprietor and Manufacturer.
Artificial eye. Artificial silver nose.
Solid silver opera-glass. Gold spectacles to fold in awalking-stick.
Tortoiseshell spectacles. Improved sketching spectacles, without rim to obstruct vision.
Invisible spectacles ; the frame being let in, the glass isconcealed.
281 Woodman, James T., 6 Commercial Place, Cornnie> ■cialBoad, Peckham —Inventor and Manufacturer.
Portable self-adjusting leg and foot-rest. Its advanjtages consist in the facility of being raised to the requireheight, and its immediate self-adaptation to the posh 1 ®in which the leg or foot may be placed. If necessary th _whole action may be made rigid without removal of th®limb. As to size, it can be packed in a common carpet bag-
273 Bayley, Robert, 18 Half Moon Crescent, WhiteConduit House —Manufacturer.
Gold and steel spectacles.
274 Goddard, James Thomas, 35 Coswell Street —Manufacturer.
Achromatic object-glass for a telescope of 9 inchesaperture, and about 1C feet focus.
[The larger glass placed in telescopes, oi' that which isplaced the farthest from the eye, is termed the object-glass. If this glass consists of a single lens, the image ofa circular object will not be a perfect circle, as it oughtto be, for such a lens will not refract all the rays fallingupon it to a single point, and will cause an image in itsfocus to be both distorted and coloured; the former defectarises from the fact that no spherical lens will produce aperfect image ; and the latter, from the unequal refrangi-bility of the coloured rays which, united, form a perfectlycolourless image, and thus the image will be surroundedwith several colours. The most important improvementin object-glasses was made in the year 1757, by Dollond .This was effected by making the object-glass double, oneportion being made of flint-glass and the other of crownglass, of different refractive powers, which mutuallycorrect each other, and thus give a pencil of lightentirely colourless. Such object-glasses are called achro-matic.—J. G.]
274a Evans, W., Brecknock, South Wales —Inventor andManufacturer.
Artificial leg, to enable persons who have lost the kneeeither to walk or ride. By a concentric action a stiffnessis given to the knee-joint, which causes a pressure in thestirrup equal to nature, and requires only a touch of thefinger outside the trousers or breeches, under the knee-joint, before mounting; by a similar touch on the frontof the thigh, before dismounting, the pressure is removed,when the person may walk with ease.
283 Braithwaite, S., 169 Kirkgate, Wakefield —Inventor and Manufacturer.Registered ventilating eye-shades.
284 Stark, Robert M., 1 Hope Street, Edinburgh—Inventor and Manufacturer.
Microscopic objects of vegetable origin, prepared o'gutta percha cells; intended as a substitute for glass ce >being equally durable, and produced at less cost. I . ’are adapted for most vegetable and animal tissues, reqming to be kept in a liquid medium. .
Slides for exhibiting opaque objects under the mi® 1 . gscope. The groove in the centre, to receive the covei,made with a circular bit designed for that purpose.
[It is an evidence of the progress of microscopic kuo 1 * 1ledge, that the preparation of objects of the kind descnconstitutes at present a distinct art.—R. E.]
285 Jordan, Charles, 37 Chapman Street, Manchesle>Inventor and Manufacturer.
Case of optical instruments for surgical and othei P U1oses:— . a i
No. 1 is an instrument for the inspection of the iu lel ^
. arts of the ear. The instrument as seen in the ’with silver truncated tube, is for the ear only. The situbes Nos. 2 and 3, the two long brass tubes, the sh 1 “
tube No. 4 (with magnifier), and the large brassare used for other internal parts of the body. aU
No. 5 is an instrument for the Eustachian tube • ^elastic tube is made to slide inside a silver one, and m g fthe elastic tube, is a steel spring wire for the purpogiving curvature to the elastic tube, when introducethe Eustachian tube. .
Before introducing the instrument the elastic a ndmust be partially withdrawn from the silver j e j aS ticwhen the orifice of the Eustachian tube is felt, the ^ tj}tube must be gently slid therein, when the springwill adapt itself to the required curve. . cll r-
The wire is intended to convey a feeble galvanirent through the membrane tympani, through ‘ g ; saperture at the end of the elastic tube; when thewithdrawn, fluid or vapour may be injected.