Electrotype manipulation |
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acid water action alloy anode apparatus application arrangement art of Electrotype beautiful cards cathode chemical affinity clean connected constant battery copies copper plate copper-plate cyanide cyanogen Daguerréotype Daniell's battery decomposed decomposition cell deposition of copper described diaphragm effected Elec ELECTRO-ETCHING Electro-Gilding electrolysis Electrotype medals electrotypist employed engraving etching experiment furnish fusible alloy fusible metal fusible moulds gauze gilding and plating gold or silver heat hydrochloric acid hydrogen immersed inches latter liquid means melted mode negative metal negative plate nitric acid noble metals object obverse and reverse Old Bailey operation oxide oxygen patent placed plaister of Paris plate of copper platinized platinum plumbago portion present printing produced readily removed render salt secondary results sheet of copper silver or gold single cell solution of sulphate substances sulphate of copper sulphuric acid surface thickness tion treatise trough varnish vessel Vide Proceed voltaic electricity voltaic pair wax moulds zinc
Beliebte Passagen
Seite 34 - There is, however, ex necessitate rei, this difficulty, with respect to prints from Daguerreotypes, — if the plates be etched to a depth sufficient to produce a very distinct impression, some of the finer lines of the original must inevitably run into each other, and thus the chief beauty of these exquisite images be destroyed. If, on the other hand, the process be only continued long enough to leave an exact etching of the original design, which can be done to the minutest perfection, the very...
Seite 40 - In every work regard the writer's end, Since none can compass more than they intend; And if the means be just, the conduct true, Applause, in spite of trivial faults, is due.
Seite 38 - ... firstly, in the production of a printing, embossing, or impressing metallic cylinder, plate or block, having a device or pattern formed thereon, suitable for the above purposes ; such device or pattern constituting one perfect or connected design, produced from an originally engraved or otherwise executed portion of the said design...
Seite 34 - ... of the electrotype. An ordinary daguerreotype, it is known, will, when electrotyped, leave a faint impression; but in so doing it is entirely destroyed ; and this impression cannot be perpetuated ; but one thus etched at the voltaic anode, will admit of any number of copies being taken from it. To give an idea of the perfect accuracy of these, I may mention, that in one I have taken...
Seite 12 - ... of potassium ; shake them together occasionally, until the latter is entirely dissolved ; and allow the liquid to become clear. Then add a quarter of an ounce of oxide of silver, which will very speedily dissolve ; the dissolution may be hastened by heat, and, after a short time, a clear transparent solution will be obtained. Preparation of the Gold Solution. — Warm a pint of pure rain or distilled water, and dissolve in it one and a half ounces of cyanuret of potassium as before ; then add...
Seite 33 - Striae, imperceptible in the original Daguerreotype, are instantly brought out by the action of the nascent anion ; probably silver, formed by voltaic precipitation, would be found the most advantageous. I transmit with this paper some specimens of the prints of the etched plates, and of electrotypes taken from them; and in conclusion would call attention to the remarkable instance which these offer of the effects of the imponderable upon the ponderable; thus, instead of a plate being...
Seite 23 - V. the time required, however, for these experiments, depends much on the temperature. If the solutions are kept boiling, a medal may be made in a few hours : in severe weather, the action of the battery almost ceases, and it is necessary to carry on the operations before a good fire.
Seite 36 - ... it with copper, then with zinc, and subsequently applying heat thereto. — [Inrolled in the Inrolment Office, January, 1839.] To JOSEPH SHORE, of Birmingham, merchant, for improvements in preserving and covering certain metals and alloys of metals. — [Sealed 3rd March, 1840.] THESE improvements have for their object the coating or covering manufactured articles composed of wrought or cast-iron, lead, and copper, and its alloys, with copper or nickel ; such coating being effected by means of...
Seite 5 - Electrotype, discovered in England by Mr. Spencer, and on the continent by Professor Jacobi, consists in preparing for a negative plate models or moulds ($ 24. 28.) of objects to be copied ; and in so arranging the battery, or apparatus, which generates the voltaic current, (§ 63, 64.) as to release the metals in a compact and solid form.