Patents for Inventions: Abridgements of Specifications Relating to Photography

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George E. Eyre and William Spottiswoode, 1861
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Page 9 - Patents' publications (each set including more than 2,700 volumes and costing for printing and paper nearly .£2,600) have been presented to the authorities of the most important towns in the kingdom, on condition that the works shall be rendered daily accessible to the public, for reference or for copying, free of all charge. The following list gives the names of the towns, and shows the place of deposit, so far as ascertained, of each set of the works thus presented : — Aberdeen (Mechanics
Page 9 - A Description and Draught of a new-invented Machine, for carrying Vessels or Ships out of, or into, any Harbour, Port, or River, against Wind and Tide, or in a calm.
Page 7 - AD 1853) ; together with the RULES and REGULATIONS issued by the Commissioners of Patents for Inventions, and by the Lord Chancellor and the Master of the Rolls, under the Acts 15 & 16 Viet. c. 83, and 16 & 17 Viet. c. 115, accompanied by Specimen Forms of the Provisional Documents printed on sheets of the prescribed size.
Page iii - Patents are now so numerous and costly as to render their purchase inconvenient to a large number of inventors and others, to whom they have become indispensable. To obviate this difficulty, short abstracts or abridgments of the Specifications of Patents under each head of Invention have been prepared for publication separately, and so arranged as to form at once a Chronological, Alphabetical. Subject-matter, and Reference Index to the class to which they relate.
Page 9 - A FREE LIBRARY and READING ROOMS are open to the Public daily, from 10 till 4 o'clock, in the Office of the Commissioners of Patents, 25, Southampton Buildings, Chancery Lane. In addition to the printed Specifications, Indexes, and other publications of the Commissioners, the Library includes a Collection of the leading British and Foreign Scientific Journals, and text-books in the various departments of science and art. Complete sets of the Commissioners of Patents...
Page 9 - ... point; the picture should remain in the bath about ten minutes, and be then washed in warm water, and dried. By this means, the picture is rendered more permanent and transparent, and its lights become whiter. After undergoing the above operation, the transparency of calotype pictures may be increased, by causing melted wax to penetrate into the pores of the paper.
Page 8 - Post, 2s. 2d. 5. SUPPLEMENT to the SERIES of LETTERS PATENT and SPECIFICATIONS, from AD 1617 to Oct. 1852; consisting for the most part of Reprints of scarce Pamphlets, descriptive of the early patented Inventions comprised in that Series.
Page 11 - THESE improvements consist in rendering the Daguerreotype picture susceptible of producing, by printing, a great number of proofs or copies ; thereby transforming it into a complete engraved plate. The process is established upon the following facts, which have come to the knowledge of the inventor : — 1. A mixed acid, composed of water, nitric acid...
Page 1 - ... uppermost. Under the plate is placed a lighted lamp, which is to be moved about, so that the flame shall act equally upon all parts. When the plate has been submitted to this operation for about five minutes, (or until the heat has acted equally upon all parts of the plate,) it will be perceived that the surface of the silver has obtained a whitish tint or coating, and then the action of the heat must cease.
Page 52 - ... gelatine and alumina. This material is prepared in the form of slabs, for the photographer's use, in this way : The tablets or slabs are composed of gelatine or glue in its natural state, and are immersed in a bath of alumina, which is held in solution by sulphuric or acetic acid ; by this means a complete combination takes place between the alumina and the gelatine or glue.

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