Page:Federal Reporter, 1st Series, Volume 5.djvu/808

 796 FEDEBAr. BEPOBTBK. �prepare," say the patentees, "a lithographie stone in the usual way by lithographie printing. The stone is to be of a suitable size to correspond to a plate of sheet tin, large enough to eut a certain number of slips of sheet tin from, for the manu- facture of an equal number of cans. Metallio paint, of any desired color, is then applied to the surface of the stone, by means of a lithographie roller, in the usual manner, so as to cover the whole siirface of the stone with color, The plate of sheet iron is then placed upon the colored surface, of the stone, in the same manner as a sheet of paper is placed on the stone in the usual process of lithographie printing, and the stone, with the plate thereon, is then run through the lithographie press; after which the color mil be imprinted upon the surface of the sheet tin. Another stone of the same size having been prepared by lithographie printing, and the lettering or designs, which are to appear on the surface of the cans in the place of the labels, having been lithographed on the stone in the usual manner, metallio paint (of a color dif- ferent from that with which the sheet tin has been covered) is put on the stône by.a lithographie roller so as to adhere to the lithographed lettering or designs, in the same manner as if an impression had been made on paper. The plate of sheet tin, covered with a coat of color as above described, is then placed upon the stone, (the colored surface in contact with the lithographed: face of the stone,) and, the stonia„wi;th the plate thereon, is then fun threugh the lithographie press ; after which the lettering or designs will appear imprinted upon the colored surface of the sheet tin. If it is desired to have only the lettering or design whichishall serve the object of a label, and no coat of color, on iihe surface of the cans, the process of printing just described is, of course, dispensed with, and the second process of printing only applied to. After a num- ber of plates of sheet tin have been tbus printed, they are placed in a properly-constructed furnace-chamber, where they are exposed to the graduai action of a temperature sufficiently high to slightly amalgamate the colors printed on the sheet- tin plates with the surface of the latter. Any person can eàsily ascertain the proper degree of temperature required by ����