The amateur photographer, with a 4 x 3 camera, who has reached the ability to make good negatives, usually has a growing desire to make enlargements. The cost of an enlarging apparatus is often more than many care to expend on what to them is but a pastime. Those who are in this predicament may find this description of an enlarging apparatus a solution to their difficulties. It is easily made by anyone possessing a little skill, and possesses about all the desirable features of an expensive outfit. Various sizes of enlargements can be made, as the focus can be easily adjusted. The sizes here given can be modified to suit the necessities of any size of plate or enlargement.

Photography A Home made Enlarging Apparatus 246

A well-seasoned baseboard, A, 5' long and 12 to 15" wide is the first requirement. Two wooden horses similar to those used by draughtsmen are very handy, but a table may be used for the work if it is not convenient to have the horses. Procure from your grocer two packing-cases in good condition, made of thin planed wood. Those used for shipping cereals are just the thing. Make a square box, B, without ends, 18" square inside and the same in length. Reinforce the ends by cleats 1" wide around it, nailing with short brads from the inside. Make another box, B', which will snugly fit the inside of the first one, but only 6" long, with a front made of wood 1/2" thick. Before fastening in the front, cut with a fret or key-hole saw a circle large enough to re-ceive the large end of a cheap pasteboard mega-phone, C, which forms a cone-shaped connection with the lens. This can easily be made of paste-board if desired, by gluing several layers of flexible pasteboard together, and finishing with a coating of leatherette or paper, to be obtained of any bookbinder. The cone should be well fastened to the wooden front of the box B' with upholstering tacks, and should be lined and all cracks covered with dull black paper.

The interior of each of the boxes should also be covered with black paper to prevent the reflection of light, which would injure the quality of the enlargements.

The front end of the cone may be fitted with a tin tube made from a spice-box of suitable size to fit the lens, E. This can be omitted and a thick pasteboard end with a hole in it for the lens, used, if no great amount of work is to be done.

If the camera has not a removable back, two additional boxes, F and F', are required. These are made in exactly the same way as were the boxes B and B'. The box F should be 9" square inside and 8" long, the box F', which is 3" long, fitting it snugly. One end of the box F' is made of wood 1/4" thick with a hole in the center for the lens. The lens, when used for enlarging, is removed from the camera and attached directly over this hole. A camera with removable back, and a bellows, may be used in place of these boxes. Two boards, G, 20" long, 3/4" thick and of the necessary height to bring the box F to the position so the lens will exactly meet the mouth of the cone, are nailed to a bottom board 6" wide. If the boxes are made on the under side of the box F, nail from the inside two 1/2" square strips of wood, so that they will be parallel with the pieces G, and keep the box F centered and in position when focusing.

For the outside end of the box B make a shallow box, H, like a single plate-holder, or a large plate-holder may be purchased and the dividing partition removed, in one side placing a ground glass, for focusing, and when ready to make the enlargement, placing the paper in the other. If a holder is made the ground glass should be separately mounted in a wooden frame, both holder and ground glass being kept in position by brass hooks on the sides and top of the box B and eyes in the holder and frame. For holding the negative a plate-holder with the partition taken out will serve nicely, having the advantage of allowing the light to be shut off at any time with the slide. It is fastened to the box F with hooks and eyes.

If enlarging is to be done at night and gas is available, a Welsbach burner, W, with thin ground-glass globe, apple shape, is excellent, but must be moved carefully to avoid breaking the mantle. If a low wall-bracket is to be had, the apparatus can be placed at a suitable height for using it. If not, have a gasfitter connect two short lengths of |f pipe to an ell, one end connecting with a hose supply pipe and the other having a nipple, on which is placed the burner. The center of the burner should be exactly in the center of the negative and about 10" away from it. A 10" or 12" glass reflector, R, is mounted on an iron rod, the lower end being bent so as to fit a hole bored in the end of the baseboard A. If enlarging is by daylight, fit a small mirror in place of the lamp, so that it may be adjusted to reflect the light squarely on to the negative. The position has to be changed at intervals as the sun moves towards the west.

In operating, place the negative and ground glass in position, adjust the position of the boxes until a clear image of the required size is shown on the ground glass. Remove the ground glass, and place in position the holder containing the print paper, the holder being filled in the dark-room. Give the necessary exposure, previously determined by exposing small strips of paper until the right interval has been ascertained. A little practice will soon enable one to produce very satisfactory enlargements.