AND SURGICAL INSTRUMENTS.
North, North Central, and South Central Galleries.
4G3
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Wgdom.]
one of the brass pillars, and the axis carryingpi® } r °n-bar; contact is broken and renewed by a small; n tlnu m point fixed to the spindle, dipping, as it revolves,], ant * out. of some mercury placed in a cup mounted on a; ss Pillar , through which the circuit is completed. Theon trui ? en t is provided with two pair of binding screws,foi e Pah- for communication with the battery, the othergiving shocks and other electrolytical effects.
0 j. "otographic apparatus, an horizontal lathe, or machinea novel construction, for cleansing and polishing da-®reotype plates. Invented by the exhibitor.c aguerreotype sliding camera, fitted with various plate-Jhes on different plans.
for f n P ro y e< I double box with sliding covers and frames,applying the sensitive coatings,ortable mercury box. Plate-holders on different plans.A series of buffs, with the different preparations neces-.1 for cleaning plates.
; j'l’oiineter, an instrument for ascertaining the differencethe lengths of the optical and chemical focus of photo-D'aphic lenses.
Lamera-stand, designed by W. Matthews, Esq.
So V am ? ra ' s tand, and head-rest, with a series of ball andp et joints, designed by the exhibitor.
'vitl 01 tal)le folding camera and stand, for paper processes,In frames on different plans.
Pressure frames on different plans.
„ j ■lass and porcelain dishes for preparing sensitive paper’n glass plates.
Coffey, J., & Smith, J., 4 Providence Row,
. Finsbury —Proprietors and Manufacturers.
lv - Jnptoved chemical apparatus, containing a still head,a d ■ ? u ' te °f moveable pans for decoctions, extracts, &c.;still yiIlg c ' oset > a condenser for steam, and worm for othercon l’ ^. e ol'anaher containing them acting as a stand andSensing tub. The temperature can be regulated byan ,nS °f steam-cocks and valves. There is also attachedun P r °ved feed for boiler, steam-gauge and thermo-ter ; safety-valve and alarum.
456
Statham, W. E., 4 Rotherfidd St. South , Lower Roacl,Islington —Inventor and Manufacturer.
^ 1 ortable chemical cabinets and laboratories for amuse-pi-i analysis, and chemical research.
Hydro-pneumatic apparatus, containing a large pneu-matic trough, a gasometer, and an hydraulic blowpipe,|h m P> and tongs complete. Larger apparatus of the same“d for the lecture-table and laboratory.
Griffin, John J., & Co., 53 Baker Street —p Manufacturers.
a rts yaduated glass instruments for chemical testing in theiUo n ’. applicable to the examination of soda, potash, am-lirno't’ m * nera l acids, vinegar, bleaching powder,SaU S . es > solutions of iron, silver, and other metals,g^Pnngs, white lead, and other chemical products;of ..aatcd measures for liquids, showing the usual divisionsg ® ln >perial gallon ; and for gases.ii 1Vl) Raf decimal weights and measures, founded on thetorv gallon and the avoirdupois pound, with explana-g tables,
ovafc 0 ^ hydrometers, with Twaddell’s scale of improved
sp^t ies " hydrometer for determining the strength of6ree s S at any temperature, according to the de-
Scal es 0i: . thes’, hy means of one glass spindle, having two^ ^tthout weights, but with a thermometer.
A »]„ rn °njamctei', or hydrometer for liquid ammonia,"a! tp SS t s Phtdle with a scale of 100°; every degree showsof s 0 [^ atom or 212 • 5 grains of dry ammonia in a gallon
for chemical apparatus, in a portable cabinet, adaptedCo l<m;!‘i-’ ca ' researches by naval and military officers,Cab’ ® n S ine ers, &c.
I ^ e tern- le - t a PP ara tus for use in colonial sugar-works, ina 't'ount Illln ® density of cane-juice, and the exactIhvb* lime required for properly clarifying the juice.cea by l)r. Shier.
Apparatus for the chemical analysis of urine. Portablecollection of chemical apparatus for elementary experi-ments.
Set of apparatus for testing the hardness of watersinvented by Professor Clark. ’
[Clark’s test for the hardness of water consists in addinga standard solution of soap to water until it produces alather, the quantity used indicating the degree of hard-ness. Most waters contain lime in the state of carbonate,with some sulphate of lime, and chloride of sodium. Thewaters supplied to London give these substances in thefollowing proportions, according to the analyses of Mr.Richard Phillips :—
Brentford. Barnes. Chelsea.
Carb. of lime . . . 16-000 16-900 16-500
Sulph. of lime, chi. of sodium 3 ■ 400 1 • 700 2 • 900
Dr. Clark has shown that a certain measure of his test,solution of soap, is required to combine with each grain ofcarbonate of lime, and that the whole of it which is pre-sent in the water must combine with the soap before alather will form. The apparatus exhibited is for measuringthe soap solution with great accuracy, and for adding itdrop by drop to the water under examination. The Boardof Health requires that every new source of water supplyshould be thus examined, and the number of degrees ofhardness stated according to Dr. Clark’s scale. Some che-mists have lately pointed out sources of error in this pro-cess, but Dr. Clark states these may be avoided by care.—R. II.]
Chemical thermometers for corrosive liquors. Set ofblowpipe apparatus for the examination of minerals. Col-lection of small specimens of minerals, in a portablecabinet, adapted for travellers in the colonies. Models ofcrystals executed in pottery. Apparatus for teachingagricultural chemistry in parish schools, Test-bottles,with indelible inscriptions, for chemical use. Glass vesselsfor holding chemical liquors, made in Bohemia. Books oftest-papers. Circular filter-papers. Frame with pegs fortest-tubes. Stoneware lamp-furnace for chemical opera-tions. Beale’s furnace for executing combustions in organicanalysis by gas. Beale’s gas furnace for heating crucibles.Improved achromatic microscope and polariscope, for na-turalists and physicians. Ackland’s improved combinationof Smee’s galvanic battery, in which the kind and amountof power can be readily modified. Ackland’s improvedform of medico-galvanic machine, with single current,producing great power in a small compass.
458 Allman, Fennell, 12 Stanhope Place, Hyde Park—Inventor.
An electric table-lamp, suitable for a room, with an-other, illustrating the way in which the dynamic effect ofthe current is made to govern the lamp. The most im-portant features of the invention are the employment ofelectricity as a substitute for coal gas, oil, candles, &c.
The novelty consists in the employment of the dynamiceffects of the electric current to produce the conditionsnecessary for the maintenance of a constant light. Thegreat simplicity of the lamp, consisting of only threeparts, renders it very durable and economic. Patented.
459 Ibbetson, Capt. L. L. Boscawen, Clifton House,Old Brompton —Inventor.
Electrotypes from the animal and vegetable kingdom.Ornamental castings in various metals ; also castings, See.,in iron, and covered with metallic surfaces, by a newmethod.
Trigonometrical model of the Undercliff, Isle of Wight .The new feature in this model is, that an extent ofcountry has been modelled from a trigonometrical survey,the vertical heights being on the same scale as the base,three feet to a mile. The model was carried to the spotand modelled, and the hypothenuse lines made to cor-respond with the base. Upwards of 20,000 heights were