US297851A - Thomas c - Google Patents

Description

(No Model.)

T-.f8.-800 H E.

ENLARGING CAMERA.

WITNBSSES ATTORNEYS? UNITED STATES THOMAS c. EOOHE, OE BROOKLYN,

vASSIGNOR TO E. St H. T. ANTHONYl St CO., OF NEW YORK, N. Y.

ENLARGING-GAMERA.

'SPECIFICATION formingepart of Letters Patent No. 297,851, dated April 29, 1884. y Application led January 30, 1884. (No model.)

.To @ZZ whom it may concern: y Beit known that I, THOMAs C. ROCHE, of Brooklyn, in the county of Kings and, State of New York, have invented certain new and useful Improvements in Enlarging-Gameras, of which the following is a full, clear, and exact description.

The obj ect of this invention is to provide a cheap, simple, and efficient apparatus for enlarging negatives upon sensitivejpaper or material, in order that a' distinct enlarged positive picture may be easily obtained.

Heretofore, owing to the comparative lack of sensitiveness of the sensitive Vsilver paper,

it has been necessary to employ expensive apparatus, or what are known as solar cameras, for effecting the necessary enlargement by the rays of the sun; but, by the use of sensitive bromide-of-silver gelatine paper, such apparatus may be dispensed with, and acamera-box, substantially as hereinafter described, be substituted, and by it an artificial light be used, and. only a brief` exposure rendered necessary.

The invention comprises various novel devices, constructions, and combinations ofl drawings, forming part of this specification,

in which similar letters of reference indicate corresponding parts in all the iigures. v

Figure 1 represents a vertical section, mainly upon the irregular line m in Fig. 2, of an enlarging-'camera embodying my invention; Fig. 2, a horizontal section or mainly sectional view of the same; Fig. 3, a partially-sectional end view of the devices used for adjusting the expanding and contracting device or bellows which carries the` front or portrait lens; and Fig. 4:, a face view, upon a smaller scale, of the condenser or condensing-lens, with its carrying-slide and means for guiding and holding it in position.

A is a rectangular-shaped box, of any suitable material, to the front end. of which lis attached, in a rigid or secure and light-tight traction or expansion ofthe bellows, is locked or held in place by a set-screw, s. The lens in the front portion'of thc bellows maybe an ordinary portrait one, attached to a removable board in the ordinary manner.

The top front part of the box A is provided with a hinged door, E, for the purpose of obtaining access to said part of the box. Upon the interior of each side ofv this part of the box are arranged vertical racks F F, or a series of vertical grooves, d d, in the interior of the sidesof the box, for the purpose of varying the adjustment relatively to each other of the condenser or condensing-lens G and negative H, and which may also be used to provide for the insertion, in front of the negative, of a vignetting-board.

I is the sliding board, to which the negative may be secured by springs e e in the Ordinary manner; and J, a sliding board carrying the condenser or condensingflens G, which'may also be held in its slide by springs c e, to provide for its ready insertion and removal when required. These boards I J are entered'down within the grooves d dof the racks, and are provided with side springs, f f, for holding-them by friction against the walls of the grooves at their required height. The object of this adjustment will be apparent when it is considered that it often only is required to enlarge a portion of the negative-as, for instance, the head of a person or gure thereon-which portion accordingly requires to be raised or lowered lto bring it opposite the center of the tube or front lens; hence the vertical adjustment of the slide carrying the negative in the manner described is a great convenience, and the condensing-lens may be'adjusted as required.

At the back o1' the box A is a door, K, through the opening covered by which the lamp L, that may be of any suitable description, and which is provided with a reflector, g, is moved in or out, as required. The bottom of the box is provided with any number of apertures, h, to admit air for keeping up lcorlrlibustion in the lamp, but not admitting ig t.

In one or both sides of the box A, in the rear portion thereof, is a pane, M, of red or ruby glass, protected by a door, N, so that the use of the light may be obtained for examining the sensitive paper before exposure, or for the purpose of development. By removing the lens, lamp, and slides carrying the condenser and negative, and inserting in place of the lens a negative, the box may be used as a copying-camera, the lens of the camera in such case being placed at or in the rear doorway of the box. A lnetal or other chimney, O, is mounted on the top of the box over the lamp, to provide for the escape of heat and products of combustion, and to deiiect the upward rays of light and prevent the same from passing out.

The operation is as follows: Supposing it is desired to produce a vignette picture, I insert a slide, having an oval or round hole in it, in one of the advance pair of oppositely-arranged grooves d d, and in a pair of grooves in rear thereof place the slide I, which holds the negative at a suitable height to bring the head of the person or gure, or other portion of the negative which requires to be enlarged, opposite the center of the front lens. In two or three or any desired number of pairs of grooves d d in rear of this I locate the slide J, which holds the condensinglens, the focal center of which should be opposite the center of the front tube-lens, and in the back of the box I place the lamp with its reector, the focal center of which should also be in line with the center of the front lens. Upon any suitable screen or board, infront of the forward lens and at a suitable distance therefrom, is located the sheet of sensitive paper, with its sensitive film facing said lens. I first regulate the size of the enlarged image by moving the portrait lens or tube C through its attached bellows by means of the slide D to or from the camera-box, and then secure the same by the set-screw s. The image then is sharply focused upon the screen, which is to carry the sensitive paper, by means of the usual adjusting-screw on the front lens. Vhen this is done, the forward or portrait lens is covered with a cap of ruby glass, which throws upon the screen a red image of the picture. The sensitive paper, not being affected by the red light, is next fastened, by pins or otherwise, to the screen and in proper position. The ruby or red glass cap is then removed, and the white enlarged image 'is exposed upon the sensitive paper. The necessary exposure need only be brief-say from one to four minutes, or thereabout, according to the strength ofthe light, the density of the negative, and the sensitiveness of the paper.

In place of the condenser G, a ground glass may be used to diffuse the light, in which case the exposure must be longer.

The grooves d d or slideways, arranged as shown, afford much convenience to the operator in an enlargingcamera, by reason of their permitting of the different slides being easily and quickly changed or adjusted without entailing any liability of parts or devices to get out of order, and forming a simple and inexpensive means of securing the desired result. l Instead of a ruby glass in the side or sides of the rear portion of the box, any other suitable non-aetinic glass or material may be used.

In addition to the condenser and negative or picture slides G H, such other slides as are desired may be used in the grooves cZ-as,

for example, glass slides of different colors.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is'- 1. In an enlarging-camera adapted to use an artificial light, the camera-box having a lamp and reflector chamber in its rear end, constructed with a series of interior grooves or slideways at or near its forward end, adapted for the reception and adjustment of the condensing and picture slides, and an opening to the grooves to facilitate the adjustment of the slides, said opening being closed by a cover or door, substantially as and for the purposes specied.

2. In an enlarging-camera, the combination, with the box A, having a series of interior grooves, d d, near its forward end, of the slide J, fitted with a condensing-lens, the negative or picture slide I, and the bellows B, with its attached lens, essentially as and for the purposes herein described.

3. The slides I J, or either of them, provided with holding-springs at their sides, in combination with the slideways or grooves d d in the interior of the sides of the camerabox, essentially as and for the purpose herein set forth.

4C. In an enlarging camera, the box A, having a series of interior slideways in its front end portion, a lid or door for insertion and removal of a lamp and reflector, g, within and from its rear portion, one or more airfeeding inlets in its bottom, and a chimney in its top, over the place occupied by the lamp, substantially as specified.

5. The combination, with the box A, having a series of interior slideways or grooves in its forward end portion, for the insertion, removal, and adjustment up or down and toward or from each other of a negative or picture carrying slide and condensing-lens slide, or diffusing-glass, of a lamp and refiector, g,

IOO

IIO

in the rear portion of the box, andv a front at o near its rear end, and construetedto form i lens o1' lens-tube in close adjustable oonneea 1amp-chamberyat said end, essentially as and tion with the forwardend of the box, essenfor the purposes specified. A

tiallyas described. n v THOMAS. C. ROCHE. 5 6. In an enlarging-camera for operation by Y Witnesses:

artificial light, the camera-box provided with C. SEDGWICK,

a non-ctinic glass in one or both of its sides,' EDV. M. CLARK.

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