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George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 3, 15th edition. 18 0 Browse Search
Charles Congdon, Tribune Essays: Leading Articles Contributing to the New York Tribune from 1857 to 1863. (ed. Horace Greeley) 18 16 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 8 0 Browse Search
Southern Historical Society Papers, Volume 19. (ed. Reverend J. William Jones) 3 1 Browse Search
James Parton, The life of Horace Greeley 2 2 Browse Search
James Redpath, The Public Life of Captain John Brown 2 0 Browse Search
Southern Historical Society Papers, Volume 3. (ed. Reverend J. William Jones) 2 0 Browse Search
Southern Historical Society Papers, Volume 35. (ed. Reverend J. William Jones) 2 0 Browse Search
Southern Historical Society Papers, Volume 18. (ed. Reverend J. William Jones) 2 0 Browse Search
Southern Historical Society Papers, Volume 16. (ed. Reverend J. William Jones) 2 0 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for Hawks or search for Hawks in all documents.

Your search returned 4 results in 3 document sections:

Knight's Mechanical Encyclopedia (ed. Knight), A. (search)
6 by Garces, who observed the Indians using a native red earth for paint. It does not appear to have come into general use in the silvermines of Peru, as a means of extracting the silver from the earthy particles, till 1571, when Pero Fernandas de Velasco came to Peru and offered to refine the silver by mercury, as he had seen in the smelting-houses in Mexico. His proposals were accepted, the old methods abandoned, and that of amalgamation pursued as it is practised at present. In 1572, Hawks writes that an owner of a mine must have much quicksilver, and as for this charge of quicksilver, it is a new invention, which they find more profitable than to fine their ore with lead. — Hakluyt's Voyages. The number of patents granted in the United States for amalgamators cannot be readily stated, as so many of the crushers, grinders, and arrastras become amalgamators by the addition of mercury. To state the whole number would give an exaggerated view, as many of them are merely mecha
Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
traction of gold or silver from comminuted ore by exposing it mechanically to molten lead, with which it forms an alloy. The subsequent separation is by cupellation or, with silver, by Pattinson's process. See infra. In reducing silver ores, the ancient Peruvians mixed them with galena or lead in portable ovens. It is still practiced in that country. Quicksilver was well known in Peru among the Incas, but was used to make the pigment vermilion, not to amalgamate the precious metals. Hawks writes, A. D. 1572, that the process of amalgamating silver ores with mercury is being substituted for melted lead. See amalgamator. In Bursile's English patent, February 12, 1853, the ore is treated with an amalgam formed by the union of quicksilver in a readily fusible alloy of lead and bismuth, or lead, bismuth, and tin. Lead-bath for precious ores. In Fuller's apparatus, the comminuted ore occupying the central shaft D is discharged in a diffused condition beneath the column o
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
w. Gage-saw.Scroll sawing-machine. Gang-saw.Segment-saw. Gate-saw.Set-saw. Gig-saw.Shingle-mill. Gin-saw.Shingle-saw. Grub-saw.Skip-tooth saw. Gullet-saw.Slabbing-gang. Gummer.Slabbing-saw. Hack-saw.Spherical saw. Hand-saw.Spindle-saw. Hawks'-bill tooth-saw.Stadda. Hey's saw.Stave sawing-machine. Ice-saw.Stocker's saw. Indicator for saw-teeth.Stock-gang. Inlaying-saw.Stone-saw. Inserted-teeth saw.Subcutaneous saw. Ivory-saw.Sweep-saw. Jig-saw.Swinging-saw. Joint-saw.Tenon-sawing, December 20, 1864. Attempts to crystallize a mixture of corn or starch sirup and cane-sugar. Percy, February 28, 1865. Whey of milk and albumen boiled, and the resulting lactine treated with sulphuric acid or malt to produce glucose. Hawks, June 27, 1865. Ground malt is macerated with corn meal and elutriated to remove saccharine, which is evaporated in vacuo. Goessling, September 5, 1865. Soak corn in alkaline ley. Crush, strain, and add the starch to a boiling acid solution,