US402279A

US402279A - Photographic paper

Info

Publication number: US402279A
Authority: US
Publication date: 1889-04-30
Anticipated expiration: 1906-04-30

Description

(N0 Model.)

, RH, ROGERS. PHOTOGRAPHIO PAPER. No. 402,279. Patented Apr. '30, 1889.

qm vtwaooo, R f gum mica, i R w Q 3 a'oww X UNITED STATES PATENT OFFICE.

FREDERICK H. ROGERS, OF LOS ANGELES, CALIFORNIA, ASSIGNOR OFONE- HALF TO CHARLES CONKLIN BELL, OF MINNEAPOLIS, MINNESOTA.

PHOTOGRAPHIC PAPER.

SPECIFICATION forming part of Letters Patent No. 402,279, dated April 30, 1889.

Application filed April 9,1888. Serial No. 270,123. (No specimens.)

To all whom it may concern."

Be it known that I, FREDERICK I-IoRAcE ROGERs, a subject of the Queen of Great Britain, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Improvement in Photographic Paper, of which the following is a specification.

My invention relates to photographic paper prepared for the reception of the silver; and the object of my invention is to produce a photographic paper upon which can be produced, by simple and inexpensive means, a brilliant black and white photographic image upon a mat or unglazed surface, thus causing the photograph to give the effect of a print, and whereby the surface of the paper, after such photographic image produced upon it, will be in a suitable condition to be worked upon with facility by artists in water-color or crayon and stamp.

A further object is to reduce the cost and labor in toning the print.

My invention consists in covering the sur-, face which is to receive the print with a thin coat of the following solution or its chemical equivalent:

I take thirty-two ounces of water and dissolve enough common salt therein to make the solution register "10 by the silver test.

The amount required is about one-half ounce tion to color the resulting print.

The solution may be applied by meansof rollers, or it may be applied by a brush or other suitable means and then removed as completely as possible by a scraper or other means. It is desirable that the coating be thin. When the paper is dry, the prepared surface is coated with silver, and all subse- 5o quent treatment of the paper to produce a photograph is the same as that employed with the paper in ordinary use, excepting that less time is required for printing and only about one-fourth the amount of gold is required to tone it.

I believe the proportions specified to be calculated to give the best results; but it is obvious that they could be changed somewhat without seriously affecting the result, and I do not wish to be limited tothe exact proportions set forth. Neither do I wish to be limited by the use of gelatine nor to the use of paper as the body upon which to apply the solution; nor do Iwish to be restricted from the use of acids or other chemicals in the preparation of the paper if Idesire to render the silvered paper more durable or to render the resulting print of a dilferent color. It is obvious that the chloride may be applied in other forms than that of common salt. When the print has been toned properly, I fix it in hyposulphate of soda, as usual. This solution will wash off entirely and leave the surface of the paper perfectly clean, white, and unimpaired.

The compound when applied to the paper as herein set forth does not perceptibly change the appearance of the paper. The accompanying drawing represents a sheet of paper prepared as herein set forth.

Vhat I claim as new, and desire to secure by Letters Patent, is

Photographic paper coated with a compound formed by the admixture of water, salt, albumen, and ammonia, in or about the 8 5 proportions specified,

F. 1-1. ROGERS. Witnesses:

Ms. B. TOWNSEND, H. O. FINLAYsoN.