US109551A - Emil eye - Google Patents

Description

E. RYE. MODE or PRODUCING LITHOGRAPHIG corms FROM PHOTOGRAPHIG NEGATIVES.

No. 109,551. Patented Nov. 22, 1870.

UNITED STATES PATENT OFFICE.

EMIL RYE, OF COPENHAGEN, DENMARK.

IMPROVEMENT IN-THE MODE OF PRODUClNG LITHOGRAPHIC COPiES FROM PHOTOGRAPHlC NEGATIVES.

Specification forming part of Letters Patent No. 109,551, dated November 22, 1870.

To all whom it may concern: Be it known that I, EMIL RYE, of Copenhagen, in the State of Denmark, have invented a new and useful Improvement in the manner clear, and exact representation of my-invention, reference being bad tothe accompanying drawing making a partof this specification, inwhich- Figure l-represents a perspective view of a drying apparatus, and Fig. 2 is a perspective view of a ciosed vessel provided with perforations or recesses.

' .The nature of my invention consists in the preparation of a plate made of glass, porcelain, zinc, or other suitable material, which, after having undergonea chemical process, the picture from a photographic negative is transferred, and permanently secured in the coating which covers said plate, and as many lithographic copies as desired Inav be printed from it.

To enable others skilled in the art to make anduse my invention, 'I will describe its construction and operation.

The plate from which the lithographic copies are taken consists of glass, porcelain, zinc, or any other suitable material, and is prepared in the following manner: When the print-plate consists of glass, (ground glass is preferable,) its surface is polished very smoothly, thor oughly cleaned, and then provided with a coat of the white of an egg, and dried in the drying apparatus A. This apparatus consists of a rectangular-formed closed vessel, forming the bottom, and resting on four legs. Immediately above it, and at each corner of the vessel, is a vertical standard of about one foot in height, secured to the top plate of the vessel B. Between these four corner-posts canvas or other suitable colored fabric is suspended in such manner'that a perfectly inclosed space is formed, which serves as an owner drying- -p1ace, from which light is partly and dust entirely excluded. A door, A, is provided at one of the sides of the drying-place, and

hinged to the vessel 3 at A., The bottom part or vessel B serves as a resting place for the plates to be dried; and in order to secure an equal temperature the vessel is Iilled with water, introduced through pipe'U. Through the pipe D water may be drawn from the vessel B, and the heat is communicated through a lamp or other device placed below tue vessel B. When the Water has been introduced, a glass tube, 0, and the India-r11 bber tube U, is secured to the induction-pipe (3, through which the steam passes into the receptacle in.

In order to keep the water contained in the vessel B at about the same temperature, a.

- thermometer may be attached at some convcuient place.

Fig. 2 shows a perspective view of a closed vessel, G, into which bottles, 850., may be placed. Under the vessel G- a lamp is placed, in order to heat the water contained in said A thermometer, G", is attached atperformed, the print-plate'is again made wet with a solution consisting of the following ingredients: Water, ichthyocolla,'whitc sugar, chromate of ammonia, albumen, and ox-gall; to this composition add lupuliu, myrrh, benzoe, and tolu-balsam dissolved in spirit vini, and further add some drops of a composition consisting of iodide of cadmium, bromide of cadmium, and water. The print-plate is then dried in the inclosure A, and is now ready to receive the impression from the photographic negative.

The process of transferring the picture from the negative to the print-plate is performed in the usualmanner, by the agency of light. The print-plate is then submerged in water till the greater parts of the chrom-salts are. abstracted, and when'it has become dry again it is ready for printing. When the printing process is to ing-roller, provided with the commonly-used lithographic ink, which is mixed with varnish or copa-iva. balsam. -Any lithographic press and any kind of paper may be used.

WVhen the operator desires to employ printplates consisting of metal sheets, zinz ought to have the preference, it being the cheapest,

and, easiest to treat. The zinc print-plate is first provided with a well-polished surface, and then corroded with a solution of one part chrom-acid and forty or fifty parts of water;

then washed in cold water, and. a solution of from one to ten parts of ichthyocolla poured over it. Only in this preliminary working it is different from the process which the glass print-plate undergoes. The whole time re quired to prepare a print-plate will amount to about one or two hours.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The herein-described process'for covering plates with plane and smooth surfaces with a preliminary coating prepared with chrom-acid, on which the picture from a photograph negative may be transferred and secured, and then serve as a print-plate from which lithographic copies may be taken,substantially as and for the purpose set forth.

2. The combination and arrangement of the drying apparatus, consisting of a closed vessel, B, forming the bottom, and provided with pipes O and D, standards A(, the cover A, and the hinged doors A, substantially as described.

3. The combination and arrangement of theclosed vessel G with the apertures G, and thermometer G, substantially as and'for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

Witnesses:

C. F. OLAUsEN, W. E. BENDZ.

E. RYE.

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