This consists of 2 square wooden boxes, the one sliding like a telescope, within the other. On the front of this is screwed an arrangement of lenses, capable of adjustment; and at the other end is a movable screen of ground glass.

Miniature Paper Camera

It is possible to obtain fair negatives by arranging a sensitive dry plate in one end of a suitable box, while in the centre of the opposite end is a fine needle hole through a thin piece of metal attached to the outer surface of the box. Practically this idea has just been carried out in a small camera recently put upon the market.

The camera bellows is nothing more than a heavy brown-black paper box made in two folds, the whole when fully extended measuring about 3 in. The front portion of the paper bellows is pasted over the edges of a rigid sheet of straw board, cut to the size of the sensitive plate, thereby forming the camera front, and in the centre of this is an aperture about 1/4 in. diameter, covered by a film of ruby and green coloured isinglass, pasted on the inner face of the front. A minute needle hole is punctured through the centre of the thin isinglass which forms the lens. The aperture is closed on the outside by a gummed paper flap. Cemented to another straw board, forming the back of the camera, is the sensitive dry plate. The back portion of the paper bellows is then pasted over the back of the camera the same as the front. We then have a light-tight paper box, the front provided with a pin hole and the back with a sensitive plate.

When the folds of the paper bellows are pressed inward, making the front and back come together, the thickness of the package does not exceed 1/2 in., and measures 3 1/4 by 4 1/4 in. An angle of 100° is included in the picture, and the focus is 3 in. It will be seen that its compactness makes it very handy to carry. Several cameras can thus be readily taken in one's pocket, since they occupy scarcely any more space than the sensitive dry plate itself.

In making an exposure, the bellows is extended, and the miniature box is set upon a post, chair, or any convenient support, the front being turned toward the object to be taken. The small wafer of paper covering the aperture is turned down, and an exposure of one to two minutes is given, according to the light. Upon its completion, the wafer cap is turned back over the aperture, and the box is compressed into its original compact form. The plate may be thus packed away for future development. If it is to be developed at once, the box is removed to the dark room, and the back end carrying the sensitive plate is cut off with a knife. The plate is next easily separated from its paper backing, and can be developed in the usual man-per with potash and pyro.

The peculiar advantages are that with each plate is furnished its own camera, so that both are always ready for immediate use. Mo focusing or adjusting is required.