A Dictionary of PhotographyThomas Sutton, George Dawson |
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Common terms and phrases
aberration acetic acid achromatic actinic action albumen alcohol alkaline ammonia angle bichromate boiling bromide called camera carbonate centre chemical chloride coating collodion collodion process colour combination compound contains convex convex lens dark decomposed developer dissolved distilled water ether exposed exposure film filter focal length focus front lens gallic acid gelatine gold grains gutta percha heat hydrochloric acid hydrogen hyposulphite of soda immersed inches iodide iodide of potassium iodide of silver iodine iron lenses light lime lines liquid mercury metal mixed mixture negative nitrate bath nitrate of silver nitric acid object oblique pencil obtained optical organic matter ounce oxide oxygen paper photographic picture placed plane positive potash potassium precipitate prints prism produced pyrogallic acid pyroxyline rays refracted removed resin salt sensitive sheet soluble solution spherical aberration stereoscope substance sulphate sulphuric acid surface tannin temperature tint transparent varnish washed yellow
Popular passages
Page 388 - Journal. About in the World. Essays by the Author of "The Gentle Life." " It is not easy to open it at any page without finding some handy idea.
Page 151 - How would you prove that the illumination on any surface is inversely as the square of its distance from the source of light ? 6.
Page 295 - In general, the plane determined by an incident ray and the normal to the surface at the point of incidence is called the plane of incidence.
Page 189 - The posterior compound lens has positive focal length, and would cause parallel rays to diverge from a point on the same side of the lens as the origin of light.
Page 388 - Price 6s. each; or in calf extra, price los. 6d. The Gentle Life. Essays in aid of the Formation of Character of Gentlemen and Gentlewomen. Tenth Edition. "Deserves to be printed in letters of gold, and circulated in every house."— Chambers' Journal. About in the World. Essays by the Author of "The Gentle Life.
Page 121 - ... one or more sensitive substances in a mixture of various compounds, and shows to a great extent, before such substances have been isolated, in what menstrua they are soluble, and with what agents they enter into combination. Unfortunately, these observations for the most part require sunlight. (8) The phenomena of internal dispersion oppose fresh difficulties to the supposition of a difference of nature in luminous, chemical, and phosphorogenic rays, but are perfectly conformable to the supposition...
Page 133 - Pliny ascribes the origin of glass to the following accident. A merchant ship laden with natron being driven upon the coast at the mouth of the river Belus, in tempestuous weather, the crew were compelled to cook their victuals ashore, and having placed lumps of the natron upon the sand, as supports to the kettles, found to their surprise masses of transparent stone among the cinders.
Page 258 - This surface is still further improved by passing it through the press in contact with a polished plate. A suitable piece of positive Photo-lithographic paper thus manufactured is now to be exposed to the action of light under the Negative of the map already described. This is accomplished in an ordinary pressure-frame, the time required varying from ten to fifteen seconds to several minutes, according to the brightness of the weather ; but it is always short compared with that necessary for the...
Page 10 - Operation.—Development of the photographic trace. When the paper is removed from the cylinder it is placed upon a board, and a saturated solution of gallic acid, to which a few drops of...
Page 133 - Moses, we discover glass ornaments in tombs which are as old as the days of Moses. According to Pliny and Strabo, the glass works of Sidon and Alexandria were famous in their times, and produced beautiful articles, which were cut, engraved, gilt, and stained of the most brilliant colours, in imitation of precious stones. The Romans employed glass for various purposes ; and have left specimens in Herculaneum of window-glass, which must have been blown by methods analogous to the modern.