US647901A

US647901A - Photographic roll-film.

Info

Publication number: US647901A
Application number: US73858399A
Authority: US
Inventors: Arthur W Mccurdy
Original assignee: Individual
Current assignee: Individual
Priority date: 1899-11-28
Filing date: 1899-11-28
Publication date: 1900-04-17
Anticipated expiration: 1917-04-17

Description

No. 647,901. Patented Apr., I7, 1900.

A. .W. MOCURDY. PHOTOGRAPHIC ROLL FILM.

(Application filed Nov. 28, 1899.) v

(No Model.) I 2 Sheets-She9i l.

Tl. LE2. E

' and extending some distance beyond each end essential.

UNITED. STATES PATENT OFFICE. I

ARTHUR W. MOOURDY, OF WASHINGTON, DISTRICT OF COLUMBIA.

PHOTOGRAPHIC ROLL-FILM.

SPECIFICATION forming part of Letters Patent No. 647,901, dated April 1 7, 1900. I

Application filed November 28, 1899. Serial No. 738,583. (No model.)

To all whom it may concern:

Be it known that I, ARTHUR W. McCURDY, a subject of the Queen of Great Britain, residing at Washington, District of Columbia, have invented certain new and useful Improvements in Photographic Films, of which the following is a specification.

My invention pertains to what is now gen erally known to the trade as a daylight film-.

cartridge, by which is meant a sensitized film coiled upon a spool or about itself and protected by a wrapping or envelop capable of excluding the actinic raysof light from the image-receiving portion of the film. As hitherto constructed such films have consisted of a long flexible band or strip, commonly of transparent celluloid, coatedwith anemulsion of suitable character andduly sensitized, provided at its ends with blackpapcr extensions, one or the other of which latter, being closely wound about the previously-coiled image-receiving portion, has served to exclude the actinic rays. Many films or cartridges of this character'have been provided with a continuous backing stripor sheet of the black-paper attached to one end of the film'; but in all prior daylight-cartridge films of which I have knowledge the black paper has been present and has been deemed In the class last noted it is made to bear numbers or markings indicating the difierent sections or exposures of the film and to protect the film against light entering the camera at the window or opening through which the markings are read or noted.

' Paper of the character referred to requires special and peculiar preparation and is, moreover, quite costly. It contains a large percentage of pigment or dyestuff of one or another character, which is in greater or less degree soluble in water and in the "developing and fixing baths in which the film is treated after exposure. The composition is such too that the paper is more or less hygroscopic and either by gathering moisture from the atmosphere and giving it to the sensitized film or by causing chemical or mechanical constituents of the paper to be given off to the film injuriously aifects the latter. So, too, the printed markings or numbers on the back of the paper are found to offset upon the film or to reproduce themselves thereon to the serious detriment of the negatives subsequently produced.

Ihave invented or discovered a novel mode of developing and fixing photographic films and have contrived an apparatus for that purpose. In carryingoutmy method and in using said apparatus it is necessary or at least is very desirable that the film be totally immersed in the solution or solutions during the process of developing and fixing. It is therefore of great importance thatthe film and the envelop, which is considered as a part of the film in the foregoing statement and isimmersed tlierewith,be free from any ingredient, element, or substance which either under the ordinary variations of atmospheric conditions during storage or use or under the. influence of auysolution to which thefilm willin practice be subjected might injuriously affect the film or thesolutions.

So, too, it is important that the enveloping or light-excluding sections or extensions be attached to the image-receiving portion of the film in such man'neras shall preclude detachment therefrom during manipulation of to determine the junction readily both in placing or using the film in a camera and in manipulating the same in the developing apparatus it is important that some mark'or indication be provided. This may be the line of stitching, the line of pasting or cementing the two parts together, a difierence in color or texture, a perforation, or, in fact, any distinctive mark. In practice thefilm will advisably be wound upon a spool the heads or flanges of which serve, together with the en- .the film in the process of development or fixspective'view of a s pooled fil'm" ncartfidg nih,

' maybe eIn,p1oyed,- pro 'ded care be taken in be n un L portion of the;

veloping section or covering film, to eiclud'e' the light thei'efioniatjhe;

edges; butI do'not restrict myself to the em ployment of a spool;

Having thus stated in a general way the character and purpose of the invention, I will now desc 'ihej thej same. morejjnadtailQWithfl-Q the aid of the accompanying drawings, inwhich 4 Figure 1 is a perspective view of a film pre pared in accordance with my invention, but unwound to shovvthetwo ends; ig. 2, ape

the enveloping or light-jexcluj ng piont' ashort lengthiof the image 'ec iving p0 und modesof attachment. part-s are'shown as lapped slightly one upon .The manner of attaching the light-excludingoi'fenveloping sectionsllBi-s variable, and I have in the drawings indicateddiflferent Thus in Fig. 1 the the other and cemented together; Assuming thatgwhitfe .ip apeir 461* "li ht-sawed; aper be used, this of itself would sufiiciently mark the lineor pointofijunction of the sensitized fihn'A and the: enveloping portions 13. In .ig. .2 the same construction isindicated. In 3 1 have shown a linen, of stitches, and i'gmi'raw of eyelets I). These or any .ihfilthstlitae LGQS QDIL t'ngm fastening devices he caseof past e y ins- I ansvgenbut a i it 9 the white or uncolored paper, fabric, or envelop, or of even light-colored wrappin gs, to exclude actinic rays is a matter of discovery which has been made after a long-continued use of the black-paper envelop, entailing great expense and requiring the erection of special factories for the manufacture of such paper.

The film under the present common practice being moved in the camera across an opening covered with colored glass, celluloid, or the like and being under my new process developed in a vessel provided with windows or openings having similar colored material, the difference in color between the sensitized and the light-excluding portions of 'the film may not be readily distinguished. Hence the special and distinctive mark becomes important.

Having thus set forth my invention and explained the reasons for and advantages of the construction adopted, I claim 1. As a new article of manufacture, a photographic film comprising asensitized portion, and light-excluding or enveloping end portions of white or uncolored material attached to the sensitized portion by material insoluble in the baths, substantially as described, whereby they are prevented from becoming detached in the solutions in which the film is placed.

2. A photographic film having at the end of the image-receiving portion an extension formed of white paper.

3. A film for photographic purposes, comprising a sensitized image-receiving section, and a light-excluding section attached to the image-receiving section by material insoluble in the baths, the light-excluding section being formed of a material devoid of any substance or ingredient which might injuriously affect the film or the solution or solutions in which the film is treated.

4. A photographic film consisting of a sensitized imagereceiving section of definite length, and light-exeludin g sections attached thereto by material insoluble in the baths, the sensitized portion of the film being provided with a series of perforations indicating the limitations of successive exposures or image-receiving divisions.

5. A film for photographic purposes, comprising a sensitized image-receiving section, and a light-excluding section attached thereto by material adapted to withstand the detaching effect of the baths or solutions in which the film is treated.

6. A film for photographic purposes comprising a sensitized image-receiving section, and a light-excludin g section attached thereto, the light-excluding section and the material by which said section is attached to the image receiving section being adapted to withstand the action of the baths or solutions in which the film is treated, whereby injury ofthe film and of the baths is prevented when the film is bodily immersed therein.

7. A photographic film consisting of a sensiti'zed image-receiving portion, and light-excluding end sections attached thereto, which end sections will remain firmly attached to the sensitized portion when the whole is placed in or subjected to the action of the developing or fixing solutions.

8. A photographic film comprising a sensitized image-receiving portion, and light-exeluding or enveloping sections attached to the ends thereof by cementinsoluble in the liquids to which the film is subjected.

9. A photographic film comprising a sensitized image-receiving portion, and flexible light-excluding end sections attached thereto by material insoluble in the baths, substantiall y as described, whereby they are pre vented from becoming detached when subjected to the action of a bath or liquid, the film being provided with a perforation or distinctive mark located in position to indicate the junction of the sensitized portion and'the light-excluding sections of the film.

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

ARTHUR \V. MCOURDY.

itnesses:

G. O. ToTTEN, J r., HORACE A. DODGE.