US84168A

US84168A - Joseph buchtel

Info

Publication number: US84168A
Authority: US
Publication date: 1868-11-17
Anticipated expiration: 1885-11-17

Description

ci s @timidi tant G gea JOSEPH BUCHTEL, OF PORTLAND, OREGON.

Letters Patent No. 84,168, dated November 17, 1868.

CONTACT-PAD FOR.- PHOTOGRAPHIC PRINTING.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that I, JOSEPH BUCHTEL, of Portland, in the county of Multnomah, in the State of Oregon, have invented anew and useful Apparatus forEecting a Perfect Contact of Tissues or Papers to be Printed from Photographic Negatives; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

Deswipton of Joseph Buohtels Photographic Contact Pad.

This pad is intended to take the place of the ordinary thick cloth or felt usually put between the covers of' a photographic-printing frame and the silvered paper which rests on the negative.

In the common process there is a great waste of silvered paper, owing to a number of pits and Wrinkles, which are not perfectly pressed out bythe springs and cloths in common use; for when the glass of the negative is warped or uneven from any cause, the dat boards of the covers and cloths possess no quality of adapting themselves to the surface of such glass or negative, and the result is a bad print, or, that which is worse, the frequent breaking of uneven negatives. This fault is more common than formerly, :is at the present time more cheap or commonglass is used.

The invention obviates another dii'culty which perplexes the photographer in warm weather, viz, the discoloration oi' thel white paper, by preventing the air from contaminating it during the process of" printing, as it tits air-tight at its back when under pressure; and, as the pieces are taken, one by one, from under weights, and laid on the negative, they will not be as mucli exposed as formerly.

Figure l is a perspective view.

Figure 2 is a section, showing the manner of placing the diaphragm c in the sack or 'pad a.

Figure 3 shows the manner of providing a place for filling the sack or p ad c with gas, air, or fluid, through au eyelet, b, with a screw inserted in its opening.

Figure 4 shows a common photographic-printing trame, with the pad in its place.

The sack or pad a is made of rubber cloth or any air, gas, or duid-tight material, inflated at the time of making or afterward, by leaving a small hole in each compartment, of' such a shape that it may be closed by some plastic cement; or, if not made in this manner, the eyelets b will be used with screws, of such a kind that they may be screwed into and fit air-tight in the openings of` the eyelets b.

When the pad is made with more than one apart ment, a diaphragm, e, will be always necessary, as will bc seen by reference to iig. 4, where c is the wood-work of the frame, (l the covers, a the pad, g the silvered paper, and f brass springs, pressing the covers against the pad, silvered paper, negative, and glass resting in the wood frame o.

Now, if the spring f on one of' the covers d were liberated, and the pad contained only one apartment, the filling would rushinto the end so liberated, and cou'ld not be easily put back again, such an operation being d one once or twice, as each print is examined, to ascertain how far the printing has progressed.

To prevent the escape described from the part under pressure, 'the diaphragm e is provided, making each chamber or compartment separate and air-tight. The print, by this arrangement, may be examined from either end ot' the frame without any danger of moving it.

W'hen large prints are making, it will be found more desirable toruse fluids than gases or air,.as it is more eii'eetive in removing the wrinkles as it is laid on the silvered paper.

I claim the use of the elastic pad a, filled with fluid, air, or gas, and also the eyelets b, with the attendant screws, together with the diaphragm @substantially as set forth, and for the purpose described.

JOS. BUCHTEL. [1.. s.]

Witnesses:

OnAs. B. TALBOT, S. BUOHTEL.