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Document Max. Freq Min. Freq
Harper's Encyclopedia of United States History (ed. Benson Lossing) 31 31 Browse Search
George Bancroft, History of the Colonization of the United States, Vol. 1, 17th edition. 23 23 Browse Search
Southern Historical Society Papers, Volume 10. (ed. Reverend J. William Jones) 12 12 Browse Search
Lucius R. Paige, History of Cambridge, Massachusetts, 1630-1877, with a genealogical register 6 6 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 3 3 Browse Search
Medford Historical Society Papers, Volume 24. 2 2 Browse Search
George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 2, 17th edition. 2 2 Browse Search
Cambridge History of American Literature: volume 1, Colonial and Revolutionary Literature: Early National Literature: Part I (ed. Trent, William Peterfield, 1862-1939., Erskine, John, 1879-1951., Sherman, Stuart Pratt, 1881-1926., Van Doren, Carl, 1885-1950.) 2 2 Browse Search
Thomas Wentworth Higginson, A book of American explorers 2 2 Browse Search
Horace Greeley, The American Conflict: A History of the Great Rebellion in the United States of America, 1860-65: its Causes, Incidents, and Results: Intended to exhibit especially its moral and political phases with the drift and progress of American opinion respecting human slavery from 1776 to the close of the War for the Union. Volume I. 1 1 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for 1621 AD or search for 1621 AD in all documents.

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Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
Works, 1760. The hot-air blast was invented by James Neilson, of Glasgow, and patented in 1828. Wooden bellows, in which one open-ended box is made to slip within another, with valves for the induction and eduction of air, were used at Nuremberg, 1550. They were used in the next century for smelting, blacksmithing, and for organs. Such a machine is in principle the same as Fig. 106, and the converse of that shown in Fig. 114. P. Fannenschmid of Thuringia appears to have made, about 1621, a much more effective blower than was previously used by the metallurgists of his section. This was a flat vane reciprocating in a sectorshaped box and having an inlet valve for the air. At the hinging-point of the vane, the edge of the sector, an eduction pipe proceeds from the box. Slips of wood on the edge of the vane were pressed against the sides of the box, to prevent the leakage of air. Somewhat similar to this is the oscillating or pulsating piston (Fig. 727). Blower. The f
Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
3. Gold-leaf. Gold-leaf was made in Egypt 1706 B. C. Homer refers to it. The temple of Solomon was profusely gift. Pliny states that in his time a single ounce admitted of being heaten out into 750 leaves, four fingers in length by the same in breadth. This tenuity is very far exceeded at the present day. In the practice of the art in Europe, the skin of an unborn calf was first used; afterwards a fine pellicle from the entrails of cattle. This continues to be used (see supra). About 1621, says Beckmann, Merunne excited general astonishment, when he showed that the Parisian gold-beaters could beat an ounce of gold into 1,600 leaves, which together covered a surface of 105 square feet. But in 1711, when the pellieles discovered by the Germans came to be used in Paris, Reumer found that an ounce of gold, in the form of a cube, 5 1/4 lines at most in length, breadth, and thickness, and which covered a surface of about twentyseven square lines, could be so extended by the gold-
Knight's Mechanical Encyclopedia (ed. Knight), M. (search)
in; he explained that the formation of the visual images on corresponding portions of the two retinas is the cause of our seeing single when we use both eyes; he showed that a ray of light entering the atmosphere obliquely is deflected and follows a curvilinear path, owing to the increasing density of the air as the rays travel towards the earth, and deduced from the data that the limit of the hight of the atmosphere is about 58 1/2 miles. Huyghens states that Drebell had a microscope in 1621, and that he was the reputed inventor of it; the invention is also claimed by Fontana, a Neapolitan, in 1618. Burrell asserts that the Jansens, father and son, made the first microscope and presented it to Prince Maurice and Archduke Albert of Austria. The invention was, however, clearly anticipated by Roger Bacon. Spectacles were in use A. D. 1200. The double microscope was invented by Farncelli in 1624. Dr. Hooke (1635 – 1702) made microscopes of a sphere of glass, from 1/20 to 1/50