US50981A - Improvement in photographic baths - Google Patents

Description

' PATENTE@ NOV. 14, 1865.

T.. H G I R W N.

PHOTOGRAPHIG BATH.

\ Zia/n? my www UNITED STATES PATENT OFFICE.

NELSON IV RIGHT, OF NEW YORK, N. Y.

IMPROVEMENT IN PHOTOGRAPHIC BATHS.

Speciiication forming part ot' Letters Patent No. 50,981, dated November 14, 1865.

To all Iwhom it may concern Beit known that I, NELSON WRIGHT, of the city, county, and State of New York, have invented, made, and applied to use certain new and useful Improvements in Photographie Baths; and I do declare the following to be a full, clear, and correct description of the same, reference bcingliad to the accompanying drawings, making part ot this specitication, and to the letters ot' reference marked thereon, in which- Figure 1 is a vertical section of my improved photographic bath; Fig. 2, an end view ot the same; Fig. 3, a top view of the same.

In the drawings like parts of the invention are designated bythe same letters ot' reference.

The present invention relates to certain improvements in the construction of a photographic bath patented by Bernhard Hufnagel, October 5, 1858, reissued March-19, 1861, and assigned to the present applicant.

The object of the present invention is to produce a silver-bath for photographic use which shall more perfectly than heretofore preserve the solution of silver deposited therein from all foreign action and allow the same to be -used a great number of times and until all the silver is exhausted.

The nature ot' my invention consists in the use or employment ot' the rubber packing, arranged as hereinafter fully described, for the purpose fully set forth.

To enable those skilled in the art to make and use my invention, I will speak ofthe construction of the same.

A shows a framing, to which the front and back sides B are att-ached by screws b, so as to form together a close box or outer casing. The front and back sides are arranged with doors or panels C, which may beremoved at any time for the purpose ot' examining the solution in the bath without the necessity of emptying said solution each time. Said doors or panels are so arranged that they may close perfectly tight and not admit any light to the interior of the box when closed.

Within the box, at each end of the same, I place a packing of vulcanized india-rubber, D, extending from one side ot the box to the other, and extending from the top ot' the box to the bottom, also provided with a packing of vulcanized rubber. This packing for the ends and bottom I prefer should be made of one and the same piece of rubber, and it is grooved suiciently to admit ot' theintroduction of the plates of glass, which, when inserted within these grooves, forni the sides ot' the bath.

The rubber packing, when arranged as shown, forms a perfectly-tight joint around the sides and bot-tom ot' the glass plates, and at the same time prevents the solution from coming iu contact with the framing which contains and supports the plates of glass.

F shows the cover of the box, lined on its under side with a thin strip of rubber to prevent any injurious action of the solution upon the wooden part ot the box, and to aid in the formation, when closed tightly upon the box, ot` a perfectly-tight box. This cover, instead of being hinged, as in the Hnfnagel patent, is dovetailed, and slides snugly and readily within 'the ways formed to receive it at the top of the box. The rubber lining is made about the length of the plates of glass employed.

Attached to the box upon each side are the plates of metal G, provided with the journals H, upon which journals are held the yokes I, provided with the set-screws J. These yokes I swing readily upon the journals H, and, after the cover has been inserted to its full extent within theways that receive it, are swung directly over the saine, so that the set-screws may be depressed and bear directly upon the upper side of the cover until the cover be sufeiently depressed to form, with the rubber packing, a perfectly-tight box. In constructing my improved bath the thickness of the glass plates and of the india-rubber packing is made, according to the size ot the bath, from one-eighth of an inch to half an inch thicker than the wooden frame or sidesI of the box. One of the sides is first firmly secured to the frame. The rubber packing is then placed in position, the plates of glass inserted within the grooved portion of the same, the opposite side added, after which, the other portions of the bath having been added, the same is ready for use.

The special features of my improvements are that by extending the rubber so that the same shall not only be between the plates of glass, but extend beyond them, or, more properly speaking, that the plates of glass used shall be inclosed at their ends and bottom within the rubber packing, as shown, I am enabled to form e more perfectlyftigh, joint in the construction of :i photographic bath than can' be formed if the Hufnagel mode of construction be carried out., Again, I can use or employ a cheaper article of glass', and holding the seme, as I do, securely 'within the rubloer pecking, thelsbility of the seme to breuk, either by handling or transporting, is greatly'reduoed,

The second feature, which consists in attaching the yokes or clamps directly 'to .the bath, enables me toV depress the oover'to iesfnl-l e;x. tent more readily and certainlyfthen ifrthe removable clumps or yokes in common use be employed, thus tending in e great degree to lessen the risk of leakage occasioned by a loose cover, or one not properly depressed.

pose specified.

` NELSON WRIGHT.

In vpresence of-f A.YSU1NEY DoANE, W.. I. BUCK.

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