(lite States latent ()ffice. AIONZO CHAOE, OF ITHACA, NEW YORK, ASSIGNOR OF ONE-HALF His RIGHT TO EZRA CORNELL OF SAME PLACE. Letters Patent No. 108,879, dated November 1, 1870.

IMPROVEMENT IN STEREOTYPING. -ms-m----- The Schedule referred to in these Letters Patent and making part of the same,

--O--e- I, ALONZO CHACE, of Ithaca, Tompkins county may be desired. Any liquid or gas may be employed . and State of New York, have invented an Improved to heat or cool this chamber. The bed DD is of iron. Method of Drying Stereotype-Matrices, together with C C is a platen, figs. 1,2,3,4,5, and 7, provided witli certain devices for effecting the same, of which the the strengthening-braces. B B B B BB, fig. 4. following is a specification. ... This platen OO is of iron, and contains the cham This invention relates to the drying of stereotype bere e'e e'e'e, figs. 3 and 7, which, in all respects of inatrices in a vacuum, and to the combination of a construction, is like the similar chambere eeeee in vacuum-chamber, and accompanying chambers above the bed D E), already described, which description, and below it, so arranged as to provide a vacuum, both of construction and use, answers for this cham heat, and condensation of vapor, for the purpose of ber. Either of these chambers may be used to fur drying the said matrices at a minimum expenditure of nish the vacuum-chamber V and its contents with . time, temperature, and power as nearly as may be. It heat or cold, as will be found desirable in the process is especially adapted to the rapid and economical dry of drying, these chambers C C and DD being coll ing of papier-maché stereotype-matrices at a tem nected with reservoirs of hot and cold liquid or gas, perature which will not injure the type. . which reservoir's, forming no part of my invention, The following is a description of the accompanying are not shown. The best result will be obtained by drawing: - - - - using one of these chambers for heating the contents of Figure it is a side elevation of a machine or appa the vacuum-chamber W, and the other for condensing. t devised for the purpose of applying my inven the vapors given off, upon the cold wall which forms a 0. . . partition between it and the said vacuum-chamber W. . Figure 2 is an elevation, showing that end of the It is immaterial which of these chambers is employed apparatus which is toward the right hand in fig. 1. as a heating, and which as a cooling-chamber, and Figure 3 is a vertical transverse section through the either may be used alone, though, of course, with line. J J in fig. 1. . less effect, . . . . Figure 4 is a plan. - - Two objects are attained by applying heat to the Figure 5 is a horizontallongitudinal section through contents of the vacuum-chamber V: first, more rapid the line LL in fig. 2. . evaporation; second, the preventing the matrix from Figure 6 is a horizontal longitudinal section through freezing, as would otherwise occur from absorption of the line K K in fig. 2. heat during the rapid evolution of vapor. Oooling Figure 7 is a fraction of the same section shown in the surface of one side of the vacuum-chamber W. fig. 8, enlarged, with a form of type, matrix, &c., in would tend to cool the whole chamber, and so retard the position which they occupy while drying. the evaporation but for the counteracting inflence of WW, figs. 1, 2, and 3, represent a wooden frame, the heat proceeding from the other surface. As it is, upon which the apparatus rests. with proper experience, the cold wall may be made to FF, figs. 1, 2, 3, 4, 5, 6, and 7, is an iron screw condense the vapors of the vacuum, and thus relieve frame, through the upper part of which passes the it of their tension, without checking the process of screw. S, figs. 1, 2, 3, and 4. . . . . drying, but, on the contrary, greatly assisting it. The lower part of the screw S is fastened to the The vacuum-chamber V, figs. 3, 5, and 7, is formed platen CC, in such a manner as to allow the said by screwing the platen O C down upon the bed D D, Screw to turn without becoming detached. figs. 3 and 7. The platen CC has a recess formed by By turning the lever R, figs. 1, 2, and 4, the screw the rim d, which, brought down upon the bed D D, S, and with it, the platen C C, is raised and lowered, incloses the space V. - as shown by the dotted lines, fig. 1. Air-tight contact between d and D is secured by This frame F, fig.1, has upon its under side the placing the packing f between them, and the space V, projecting pieces I, I, by means of which it is fast thus inclosed, becomes the vacuum-chamber. ened to the bed DID. In fig. 7 is shown the position of the type, matrix, DD is a hollow bed or box, figs. 1, 2, 3, 6, and 7, &c., while drying. containing the air or steam-tight chambere ée eee, Y is the form of type. divided into as many apartments as letters by the O O, the chase and furniture. partitions i i iii, figs. 3, 6, and 7. acaca at the matrix. Fig.6 shows, insection, a plan of this chamber, a 2, a sheet of wire-gauze. which is furnished with an ingress-pipe, I, and an pp. pp, a layer of cloth, paper, or equivalent abs egress-pipe, I, through which steam, hot or cold wa sorbing material. The matrix, gauze, and absorbent, ter may be made to flow in the direction of the ar each, are of equal area with the form of the type, rows, thus heating or cooling the chamber, and, by The wire-gauze a 2 allows the free exhaustion of the its means, the contents of the vacuum-chamber V, as air and escape of vapor from the matrix acaa a,

2 108,879 The layer of cloth or paper retains any moisture Matrices, however, dried in a vacuum, as he'einbe condensed upon the lower surface of the platen CC, fore described, may be obtained as rapidly as by the which is thus prevented from dropping back upon the old process, at a temperature not exceeding 80° Fah matrixa aca: a. renheit, thus avoiding all injury to the type. Erom the vacuum-clhambel V the air is exhausted I do not claim the application of heat to the drying (by any of the well-known methods of obtaining a of matrices, nor the method of raising and lowering vacuum) through the pipe H, figs. 1, 2. and 5. the platen C. C.; but The screw S, the screw-frame F, and a plain platen, I claim as my invention containing no clamber of any kind, but used to keep Providing the stereotype-matrix drying apparatus the matrix in its place while drying, are used now in with the vacuum-chamber W, to be used alone or in drying papier-maché stereotype-matrices. A steam combination with the clhambel's C C and D D, sub bed or box is also used for the same purpose, upon stantially as and for the purpose hereinbefore set forth. which the type (with matrix and blankets upon it) is ALONZO CHACE. leated by steam to a degree of temperature not far Witnesses: from its melting-point. This expels the moisture J. G. ARNOLD, from the matrices, but gradually injures the type by ALLEN GRAY, causing them to lengthen unequally. - JOHN GILLET AIRNOLD.