the lime, and the india-rubber takes the place of the gelatine.
Ivory dust mixed with albumen, rolled into sheets, dried, and polished.
Sulphate of baryta and albumen rolled into sheets.
Billiard-balls made of a mixture of paper pulp, sulphate of baryta, and gelatine, are said to be equal to those made of ivory.
Plaster of paris saturated with melted spermaceti.
The following United States patents bear upon this subject; the figures are day, month, year: —
Welling4, 8, 1857.Seeley23, 6, 1868.
Held4, 8, 1857.Welling5, 5, 1868.
Hackert31, 5, 1864.Cradenwitz25, 5, 1869.
Dupper1865.Hyatt and Blake4, 5, 1869.
Wheeler14, 11, 1865.Welling20, 4, 1869.
Wurtz1, 1, 1867.Welling27, 4, 1869.
Hackert19, 2, 1867.Welling27, 4, 1869.
Starr3, 3, 1868.Hyatt6, 4, 1869.
Starr and Welling9, 6, 1868.Hyatt6, 4, 1869.
Hyatt14, 4, 1868.Hyatt15, 6, 1869.
Gardner7, 1, 1868.Welling17, 1, 1870.
I′vo-ry-black.
A species of bone-black made by the calcination of ivory scraps, turning
McClelland, 1869, also makes dental plates.
Streeter, 1869, applies it as a veneer to dental plates; molds by heat and pressure.
Hunt, 1874; Newton, 1872; Pursell, 1872; Troutman, 1871, refer to the use of pyroxyline with dental plates, for attaching teeth.
Hill, 1869, combines with coloring-matter and asbestus; covers layers of cotton, felt, woolen, wire gauze, etc.
McClelland, 1868, adds gum-copal, coloring-matter, and phosphate of ammonia.
Dry by gentle heat, pulverize.
Seeley, 1868, adds nitro-glucose to gun-cotton in solution.
Hyatt, 1869, adds ivory-dust, bone-dust, paper, flock, or asbestus.
Heat, press, and evaporate solvent.
Spill, 1869, protects insulated telegraph-wires.
Uses a compound of xyloidine, oil-camphor, gutta-percha, and pigments.
Hyatt, July 12, 1870, grinds pyroxyline into a pulp, mixes it with finely comminuted gum-camphor, dissolves the components by heat, and continues the pressure upon the mold until the contents are cooled.
M
, or impregnation with metallic solutions.
（a.) Burnettizing, or impregnation of chloride of zinc.
（b.) Samuels's process of impregnation with sulphate of iron.
2. Second class, or injection of oily substances.
（a.) The Seeley process; impregnation with creosote, carbolic acid derived from pine tar.
（b.) Robbins's process: impregnation with heavy oils charged with creosote, carbolic acid, etc., derived from coal-tar at a higher temperature than by the Seeley pro 1866.
60,794.Samuels, 1867.
4,158.Samuels (reissued), 1870.
62,334.Holmes, 1867.
62,956.Harvey, 1867.
63,300.Prindle, 1867.
64,703Pustkutchen, 1867.
65,545.Constant et al., 1867.
67,104.Clarke et al., 1867.
68,069.Harding, 1867.
69,260.Seeley, 1867.
70,761.Taylor, 1867.
73,246.Harmyer, 1868.
73,585.Beer, 1868.
77,777.Spaulding, 1868.
78,514.Calkins, 1868.
84,733Cowling, 1868.
86,808.Bridge.
1869.
87,226.Voorhees et al., 1869.
88,392.Karmrodt et al., 1869.
No.Name and Yea