1851 Great Exhibition: Official Catalogue: Class X.: George Knight and Sons
453. KNIGHT, GEORGE, and SONS, Foster Lane.
Commercial chemical cabinet.
Urino-chemical chest, containing all the instruments and re-agents necessary for a chemico-pathological examination; designed by Dr. Venables.
Portable universal chemical furnace, on the principle of Dr. Black. It is constructed of stout sheet-iron, lined with fire-bricks; it is suited for the reduction and assay of metallic ores, cupellation of the precious metals, distillations of every kind, decompositions of substances by passing them through heated media, and for nearly every operation for which a furnace is required. With sand- baths, stoppers, crucibles, muffles, tongs, etc.; also an improved hood by the aid of which noxious fumes arising from evaporations pass readily into the flue of the furnace. Portable assay furnace and apparatus, adapted for the use of mining companies.
Various blowpipes, and blowpipe apparatus, for the examination of minerals on a small scale.
Patent improved air-pump by which a good vacuum cau be obtained in a short time. Invented by Mr. C. W. Siemens. The air-pump consists of two cylinders differing in magnitude, of which the smaller is on the top of the larger, while the valved pistons belonging to each respectively, are attached to the same piston-rod. The air withdrawn from the receiver or other vessel intended to be exhausted, is condensed in the upper cylinder into one- fourth part of its original volume, and, consequently, always possesses sufficient elasticity to pass through the discharging valve and escape into the atmosphere, the opposing pressure of which on that valve is thus counteracted in a novel manner.
Plate electric machine, on Woodward's arrangement.
Galvanic battery; Professor Daniell's arrangement, consisting of a series of six cells; each cell comprises a copper cylindrical vessel to be filled with a solution of sulphate of copper; in the centre is a porous tube containing an amalgamated zinc rod, and filled with dilute sulphuric acid.
Galvanic battery; Professor Groves' arrangement, consisting of a series of six cells, each cell being a glass vessel containing an amalgamated zinc plate, to be filled with dilute sulphuric acid, having in the centre a flat porous cell containing a platinum plate, and filled with nitric acid.
Galvanic battery; Alfred Smee's arrangement, consisting of a series of six cells, each cell being a glass vessel to contain dilute sulphuric acid; to each cell is fitted a platinised silver plate, having on each side of it an amalgamated zinc plate; the whole of these plates being connected in series to one rod or bar, they can be readily raised from or lowered into the exciting liquid.
Galvanic battery; Maynooth arrangement, consisting of a series of ten cells, each cell being a cast-iron trough to be filled with dilute nitric acid, in the centre of which is a porous cell containing an amalgamated zinc plate, and charged with dilute sulphuric acid.
Galvanic battery, for telegraph purposes; the cells formed of gutta percha, filled with • sand saturated with dilute sulphuric acid; each cell containing a copper and amalgamated zinc plate.
Working model of an electro-magnetic motive engine, being a modification of Dr. Ritchie's arrangement.
Working model of an electro-magnetic motive engine, being a modification of Bain's arrangement.
Improved electro-magnetic coil machine, with conductors etc., for medical purposes.
Larger and more powerful instrument, in which the primary or secondary current can be applied, with two batteries, water regulator, conductors, etc.
Arrangement of the coil machine, consisting of a primary and secondary coil in a vertical position. Contact is broken and renewed by the rotation of a soft iron-bar mounted between two brass pillars, situated immediately over the axis of the coil in which is placed a bundle of iron wires. The electric current from the battery passes through one of the brass pillars, and the axis carrying the iron-bar; contact is broken and renewed by a small platinum point fixed to the spindle, dipping, as it revolves, in and out of some mercury placed in a cup mounted on a brass pillar, through which the circuit is completed. The instrument is provided with two pair of binding screws, one pair for communication with the battery, the other for giving shocks and other electrolytical effects.
Photographic apparatus, an horizontal lathe, or machine of a novel construction, for cleansing and polishing daguerreotype plates. Invented by the exhibitor.
Daguerreotype sliding camera, fitted with various plate-frames on different plans.
Improved double box with sliding covers and frames, for applying the sensitive coatings.
Portable mercury box.
Plate-holders on different plans.
A series of buffs, with the different preparations necessary for cleaning plates.
Focimeter, an instrument for ascertaining the difference in the lengths of the optical and chemical focus of photographic lenses.
Camera-stand. designed by W. Matthews, Esq.
Camera-stand, and head-rest, with a series of ball and socket joints, designed by the exhibitor.
Portable folding camera and stand, for paper processes, with frames on different plans.
Pressure frames on different plans.
Glass and porcelain dishes for preparing sensitive paper and glass plates.