439
^Wodom.] AND SURGICAL INSTRUMENTS.
North, North Central, and South Central Galleries.
No. 6 is a lamp for illuminating the deep cavities of'"‘Ids in iron-founding, &c. Much inconvenience hasten been felt by moulders in large foundries for want ofj^'Sht method of directing light down the deep parts of
I J v . or y concentric shells, turned from the solid ball. Thels five inches diameter; there are 14 shells, the innerbeing l-20th inch thick and the space l-16th inche tween each shell. The tusk from which the ball wasl,, rned weighed 160 lbs.
Specimens of all the useful metals and alloys, showingae surface and fracture.
280
Solomon, Joseph, 22 Red Lion Square-Manufacturer.
King, Thomas D., Bristol —Designer andManufacturer.
Compound achromatic microscope mounted on a pyra-'Jt'dal tripod, with mechanical stage, traversing in rectan-tWar pl anes by micrometer screws, achromatic condenser,P^lariscope, double refracting goniometer, cobweb micro-e ter and other eye-pieces, insect forceps, and various,? c essories. In this microscope the weight is equally. ls tributed over the base, and when inclined at its work-§ angle, the chief portion is brought below the point of^pension; the traversing stage has divided scales and, er niers, whereby admeasurements can be accurately
Ue termined.
student’s compound achromatic and single microscope.Improved spherical prismatic illuminator, for trans-of'r Dt an d °P a< l ue microscopic objects, enabling the raysliglit to be thrown either obliquely or vertically.
Earl, Francis J., Pitt’s Head, Grange Road,Bermondsey .
Perpetual calendar. Registered.
Braham, John, 17 St. Augustine’s Parade, Bristol —Manufacturer and Inventor.
.Spectacles, from their earliest invention; various modesUonterl q;„ Newton, Drs. Kitchiner , Wollaston,
a^PIed by Sir IsaacHerschel. Peri
i«m 6o i nc i les to H inch focus. Meniscus and double-C0 ^ex lenses.
Specimens of Brazilian crystal.
Mode of producing convex and concave lenses fors Pectacl e - e yel
improvements on Wollaston’s principle of curved lenses.Model of the eye.
I Peetacles without rims; and hand-frames.sh,i?' tent pantoscopic spectacles, in gold, silver, steel, and
'ji 1 mountings.
Sa ou ble pantoscopic lens, for near and far sight; thet,.j e Worked in one disc of glass (two pairs). Registereda oo° n ° meter > for measuring and protracting angles fromcentre.
er apath’s registered gas blow-pipe.
^ 0WLEY ’ J-> Wolverhampton —Manufacturer.
of a pair of spectacles worked out of a solid piece
emst-steel.
they i >rove( I spectacles, the sides being so formed thatthey he used without being placed upon the head;pai * so 'include Braham’s patent,gp r °f spectacles, with several improvements.
Oih 0 pvi ac ^ es > exhibited for their extreme lightness, workedGloh l * cast ' stee l > weight, 2 pennyweights.pres er • r Siass travelling spectacles. Wire-gauze eye-Veli; n 7 ln S spectacles. Horse-shoe eye-preserving tra-s Pecta?.] S ^ ectac ' es - Another pair (finer). Small oval eye^Mall e ’ Preserver glasses. A similar pair, oblong,'iouble Cta ® on eye spectacles. Folding hand-spectacle, ordouble ®ye-glass. Inclosed spring hand-spectacle, or. e ye-glass. Folding hand-spectacle, or double eye-
glass. Oval single eye-glass for reading. Octagon singleeye-glass for reading. Hexagon single eye-glass forreading. Eye-glass handle, a preservative for the glass.
291 Mayall, J. E., 433 West Strand —Producer.
Daguerreotypes of various kinds.
Daguerreotype panoramas.—Niagara Falls. Fail-mountWater Works, Philadelphia . Birthplace of Shakspeare.River Avon , with a view of Stratford Church. AnnHathaway’s House.
[By a little expenditure of ingenuity, it is perfectlypossible to take daguerreotype views of nature in theopen fields, by the river side, or on the sea-shore. Allthat is necessary is to obtain a means of transferring theprepared plate, and also of mercurializing it when im-pressed, in the dark; and by a small amount of manualdexterity, with the assistance of a piece of black velvet,this may be accomplished.—R. E.]
Daguerreotype pictures to illustrate poetry and senti-ment, the backgrounds in some cases being sketched, andthe sitter posed so as to make the whole harmonise to-gether. The Soldier’s Dream (Campbell), an illustratedpoem (from life), in four tableaux. The Venerable Bede blessing an Anglo-Saxon child (after nature). The Lord’sPrayer, in a series of ten designs (from life). The FisherBoys, a study from nature; and a variety of others.
[The application of the daguerreotype to the productionof the pictures referred to is effected in the followingmanner:—The sitter, or the persons comprising the group,dressed in appropriate costume, are artistically posed soas to form a tableau vivant, and in this position are takenby the ordinary process. The background is procuredeither by placing the sitters in front of a scene paintedupon canvas, in which case the plate receives the impres-sion as usual, and the scene appears as a natural back-ground to the figures; or, in other cases, the plate ispainted with a fine brush, and the landscape, &c., arethus artificially sketched upon its surface. The practisedeye will immediately decide which of these methods havebeen adopted.—R. E.]
Frame of interesting specimens, including a portrait ofDaguerre, the inventor of the art.
[The discovery by M. Daguerre of the sensitiveness toluminous impressions of an iodized silver plate, and ofthe development of the picture by mercurial vapour,was first announced to the French Academy of Sciences ,by M. Arago, in January, 1839. The original process isnot now pursued, bromine and iodine, in combination orsuccession, being employed to render the plate sensitiveto light. — R. E.]
Daguerreotypes of sculpture, and novel applications ofthe art to a variety of subjects.
“ Crayon daguerreotypes.”
[This peculiar process is understood to be a French in-vention. In No. 1197 of the Athenamm, Mr. Mayall hasdescribed, in the following terms, the method of producingcrayon daguerreotypes:—
“ First. Take a daguerreotype image on a preparedplate as usual, taking care to mark the end of the plateon which the head is produced. When taken, and beforemercurializing, remove the plate and place on it a plateof glass, prepared as follows: Second. Cut a piece of thinplate glass of the same size as the daguerreotype plate;gum upon one side of it a thin oval piece of blackenedzinc, the centre of the oval to coincide with the centre ofthe image upon the plate. Having carefully placed theglass thus prepared, with the centre of the zinc disc, uponthe centre of the image, expose the whole to daylight fortwenty seconds. The action of the light will obliterate