Elements of Technology: Taken Chiefly from a Course of Lectures Delivered at Cambridge, on the Application of the Sciences to the Useful Arts : Now Published for the Use of Seminaries and Students

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Hilliard, Gray, Little and Wilkins, 1831 - Industrial arts - 521 pages
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Page iv - Clerk's Office. BE IT REMEMBERED, that on the ninth day of September, AD 1818, and in the forty-third year of the Independence of the United States of America, Samuel Swett of the said district has deposited in this office the title of a book, the right whereof he claims as author, in the words following, to wit : Historical and topographical Sketch of Bunker Hill Battle, with a Plan.
Page 452 - Blue vat, in which white spots are left on a blue ground of cloth, is made by applying to these points a paste, composed of a solution of sulphate of copper and pipe-clay, and, after they are dried, immersing it, stretched on frames, for a definite number of minutes, in the yellowish-green vat, of one part of indigo, two of copperas, and two of lime, with water.
Page 465 - The black oxide of this metal, in large quantities, forms a black glass ; in smaller quantities, various shades of purple. 7. Cobalt, in the state of oxide, gives beautiful blues, of various shades ; and, with the yellow of antimony, or lead, it produces green. 8. Chrome produces fine greens and reds, depending upon its state of oxidizement. Artificial Gems. — The great value of the precious stones has led to artificial imitations of their color and lustre, by compositions in glass. In order to...
Page 368 - ... for several hours with the hands. It is then formed into a flat surface, with several concentric folds, which are still further compacted in order to make the brim, and the circular part of the crown, and forced on a block, which serves as a mould for the cylindrical part. The nap, or outer portion of the fur, is raised with a fine wire brush, and the hat is subsequently dyed, and stiffened on the inside with glue. An attempt has been made, and at one time excited considerable expectation in...
Page 154 - But the occasional introduction of the Gothic outline, and the partial employment of its ornaments, has undoubtedly an agreeable effect, both in public and private edifices ; and we are indebted to it, among other things, for the spire, a structure exclusively Gothic, which, though often misplaced, has become an object of general approbation, and a pleasing landmark to our cities and villages. • WILKINS' Translation of Vitruvius, 4to. 1817 ; — ELMES' Lectures on Architecture, 8vo.
Page vi - I have adopted the general name of Technology, a word sufficiently expressive, which is found in some of the older dictionaries, and is beginning to be revived in the literature of practical men at the present day. Under this title is attempted to include an account . . . of the principles, processes, and nomenclatures of the more \ conspicuous arts, particularly those which involve applications of science...
Page 207 - ... or small towers, erected for the purpose. Over these pillars the chain passes, and is attached at each extremity of the bridge to rocks, or massive frames of iron, firmly secured under ground. The great advantage of suspension bridges consists in their stability of equilibrium, in consequence of which a smaller amount of materials is necessary for their construction than for that of any other bridge. If a suspension bridge be shaken, or thrown out of equilibrium, it returns by its weight to its...
Page 271 - B which are shut up, will be pressed outwards by a force equal to the weight of a column of water whose height is TT, and whose area is the area of the apertures. Every part of the tube AB sustains a similar pressure; but as these pressures are balanced by equal and opposite pressures, the arm AB is at rest. By opening the aperture at A, however, the pressure at that place is removed, and consequently...
Page 118 - Indeed, they could not long have stood, had it not been for the great strength of their cement. Modern brick walls are laid with great precision, and depend for firmness more upon their position than upon the strength of their cement. The bricks being laid in horizontal courses, and continually overlaying each other, or breaking joints, the whole mass is strongly interwoven, and bound together. Wood.en walls, composed of timbers covered with boards, are a common, but more perishable kind. They require...
Page 137 - ... intended as places of resort for the priests, rather than for the convening of assemblies within, were in general obscurely lighted. Their form was commonly that of an oblong square, having a colonnade without, and a walled cell within. The cell was usually without windows, receiving its light only from a door at the end, and sometimes from an opening in the roof. The part of the colonnade which formed the front portico, was called the pronaos, and that which formed the back part, the posticus.

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