US837541A

US837541A - Daylight developer for photographs.

Info

Publication number: US837541A
Application number: US31114806A
Authority: US
Inventors: Frederick C Bradburn
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-04-11
Filing date: 1906-04-11
Publication date: 1906-12-04
Anticipated expiration: 1923-12-04

Description

PATENTED DEG.'4, 1906.

P. O. BRADBURN. DAYL'IGHT DEVELOPER FOR PHOTOGRAPHS.

APPLIOATION FILED APB. 11,1906.

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FREDERICK C. BRADBURN, OF ROCHESTER, NEW YORK.

DAYLIGHT DEVELOPER FOR PHOTOGRAPHS- Specification of Letters Patent.

Patented Dec. 4, 1906.

Application filed April ll, 1906. Serial No. 311,148.

To a/ZZ whom it may concern:

Be it known that I, FREDERICK C. BEAD- BUEN, of Rochester, in the county of Monroe and State of New York, have invented a new and useful Improvement in Daylight Developers for Photographs, which improvement is fully set forth in the following specification and shown in the accompanying drawings.

This invention relates to means or devices for developing photographic negatives in the daylight; and the invention has for its main object the producing of a handy and convenient device for carrying about in the hands for quickly developing negatives in the open air as exposures are successively made.

Other objects and advantages of the invention will be brought out and made to appear in the following description, reference being had to the accompanying drawings, which, with the reference characters marked thereon, form a part of this specification.

Figure l is a plan of the developer with a plate-holder in place therein. Fig. 2 is a plan of the developer with parts omitted, a part of the tank being broken away. Fig. 3 is a side elevation of the developer seen as indicated by arrow in Fig. 2. Fig. 4 is a side sectional elevation of the developer, the section being on the longitudinal dotted line 4 4 in Fig. 1, the plate holder and carrier being removed. Fig. 5 is an end elevation of the developer and plate-holder seen as indicated by arrow 5 in Fig. 1. Fig. 6 is a transverse section of the parts taken as on the dotted line 6 6 in Fig. l. Fig. 7 is a vertical longitudinal section of a part of the tank through the axis of the supply-tube. Figs. 4 to 7, inclusive, are drawn to various scales larger than that of Figs. l, 2, and 3.

Referring to the parts shown, A in the various figures is the body of the developer, commonly made of sheet metal, as brass, consisting of a reservoir or tank B for holding a liquid and a shallow open pan O. The tank and the pan may be in a single piece or if in two or more pieces are rigidly j oinedinparallel positions, one at the side of the other, the interiors of the tank and the pan being connected by a passage a, Figs. 4 and 6, for the liquid. The tank and the pan are not on the same level, the pan being below the tank, as clearly appears in Figs. 3 and 4, to the end that it may constitute a pocket, so that only a small quantity of liquid required to develop a film or plate. The pan is formed with a large rectangular opening b, Figs. 2, 4, and 6, at the bottom, covered on the lower side by a plate or sheet e of colored material, as glass or celluloid, held by a simple frame d, Figs. 3 to 6, secured rigidly to the under surface of the pan. The pan C is further formed with outwardly-turnedhorizontal ledges ff at its upper side for receiving a removable carrying frame or carrier D, Figs. 1, 5, and 6, for receiving the plate-holder E.

The plate-holder E is of common kind, having opaque slides g g and middle cardboard partition h, forming horizontal chambers in'. for receiving the plates or iilms 7c 7c. The carrier D is formed with rests Z Z, Fig. 6, upon which' to receive the plate-holder E, and vertical sides m m for retaining said holder, the surfaces of the carrier adjacent to and around the plate-holder being upholstered or covered with iibrous strips 0 to shut out the light. The carrier D is further formed with horizontal opposing internal grooves n fn for receivinga transparent colored plate p over the developing-pan O, as appears in Fig. 6.

When in any case it is wished to proceed with the development of an exposed plate or 'film primarily inclosed in the plate-holder E, the latter is placed in or upon the carrier D, as described and shown in Figs. l, 5, and 6, the carrier, with said holder, being passed along the ledges f f to place upon the body A of the developer, as above stated. The upper colored plate or transparent sheet p being 'first withdrawn, the lower slide g of the plate-holder is pulled out, allowing the lower exposed plate 7c to drop into the panO to the position shown by dotted lines in Fig. 4, vertical centering-guides r, Figs. 2, 4, and 6, having inwardly-inclined edges, being provided to cause the plate to rest centrally in the pan. The colored glass or sheet p vbeing replaced in the carrier D, the plate-holder E is removed, leaving the exposed plate or negative c between the two opposing transparent colored glasses or sheets e p, through which the negative 7c may be clearly seen and its development watched. The transparent sheets c p are of a nature and color to exclude the passage of actinic rays and effectually prevent actinism.

In use the developer is held in the hands, with the pan C away from the person or uppermost, as appears in Figs. l and 2, the de- IOO IIO

veloping fluid s, Fig. 7, being normally in the tank B. In beginning' the operation of developing a negative the developer is for a moment held in a horizontal position, as shown in Fig. 4, allowing the liquid to flow into the pan to wash the sensitized film, which film as the plate lies in the developing-pan is on the lower face of the plate, the developer being in the mean time moderately shaken to thoroughly wash the iilm. Turning the developer again to a vertical position, the liquid flows back into the tank, and the plate becoming drained allows the operator to view the hlm through the colored glasses e p and determine as to the process of tho development and the need of further washing of the iilm, this turning of the developer to a horizontal position being repeated as many times as may be found necessary in fully developing the plate. After one plate 7c is developed the plate-holder E is again placed in the carrier D in an inverted position, and. the remaining plate 7c is dropped into the pan and developed as in the first case. The guides r serve in all cases to hold the plates up from the bottom of the pan, so that the developing liquid may iiow beneath the plates and wash their nether surfaces containing the iilms to be developed. The guide r nearest the tank is preferably made with a portion of its edge vertical, as clearly shown in Fig. 4, so that when during the process of developing a plate the developer is turned up as stated to view the plate through the colored glasses e p the plate will be held to its plage and not slide downward toward the tan i.

The tank B is provided with a tube t, Figs. 4 and 7, through which to introduce the developing fiuid s, the tube having a closingcap u. The tube is made long, with its inner discharge end near the bottom of the tank, so as to be submerged, to the end that when at any time introducing the fluid while a plate is in the pan no light will be admitted to the injury of the iilm. The tube t is threaded into the thickened upper wall of the tank, as appears in Fig. 7, so as to be readily removable from the tank when it is wished at any time to discharge the fluid.

The tank is shown in the various iigures as being rectangular in form g but this form of the tank is not essential to the invention. It may in practice be made substantially cylindrical in form or of any other desirable shape convenient to be held in the hands while developing a picture, the essential use of the tank being to conveniently hold the developing fluid.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. A daylight developer for photographic plates, consisting of a tank for holding a liquid and a pan for receiving the plate, said tank and pan being rigidly joined as in a single piece, there being a passage for the liquid between the tank and the pan a glass-holding frame beneath the bottom of said pan, and plate-receiving means above said bottom.

2. A daylight developer for photographic plates, comprising a tank for holding liquid, and a pan for receiving the plate, said tank and pan being in a single piece with communication between, the pan having an opening through the bottom and a series of rests for the plate said rests having inwardly-inclined ed'es.

A hand device for developinfr photographic lates, consisting of a holc er for a fluid anc a pan joined, with their interiors communicating, the planes of the bottoms of' said holder and the pan being parallel, and the pan being lower than said holder the bottom of the pan being rovided with an opening, and a glass-holt ing frame below said opening and plate-holding means above said bottom.

4. A daylight developer for photographic plates, comprising a holder' for a fluid, and a coacting pan, the pan having a series of internal rests having inclined edges for receiving the plate, and a rest with vertical edge for preventing the displacement of the plate.

5. A daylight developer for hotographic plates, consisting of a fluid-hol( er anc apan coacting, the pan having rests with inclined edges,l said pan having also an opening through the bottom, and a transparent colored sheet to close the opening in the pan.

6. A device such as described, consisting of a tank and a pan joined, there being an opening between the tank and the pan, the bottom of the pan being formed with an opening, a frame secured beneath the pan and a transparent sheet as of celluloid or glass held by the frame to close said opening in the pan said pan having side ledges and interior inclined rests.

7. A device such as described, having a part for holding a liquid and a pan coperating, and a carrier for plate-holders held by the pan and removable therefrom and having rests to receive the plate-holder and a transparent plate said rests having their upper edges constructed to center the plate.

8. A device such as described, having a holder for a liquid and a pan, one at the side of the other and cooperating, the pan having ledges and a carrier for a plate-holder engaging with the ledges, and a removable colored. transparent plate held by the carrier over the pan said carrier having rests with o'fl'sets and light-excluding means said rests having tllieir upper edges constructed to center the p ate.

9. A daylight developer for photographic plates, consisting of a tank for holding liquid, and a pan adjacent to the tank and communieating therewith and having interior inclined rests and a bottom with opening and trans- IOO parent plate on a plane below the planes of l In witness whereof I have hereunto set my the bottoms of the tank and pan, an lniowhand, this 7th day of April, 1906, in the prestube on the tank communicating from withl ence of two subscribing witnesses. out to the inteiior of the tank, the inner dis- FREDERCK C. BRADBURN.

5 charge end of the tube being near the bottom Witnesses:

of the tank, and a closer for the outer end of ENOS B. WHITMORE, the tube. y A. M. WHITMORE.