Making lantern slides from book illustrations without a camera is possible by a method described in Camera Craft by B. Roloff. A half-tone illustration from a popular magazine may be found to have its back covered with printed matter. Now it is desired to use that illustration as a negative, and the sensitive plate as a positive, resembling the method of a bromide paper. By printing through the illustration as it is, the printed matter on the back would also show; so the first thing, then, is to get rid of this. The illustration is cut out, placed face downwards on a piece of ground glass, and the back is wetted slightly by means of a wad of cotton or a sponge until the dampness shows signs of coming through. It must not be made thoroughly wet, as that might injure the ink on the face. With a piece of medium emery paper gently rub the moistened surface until all the ink is Off the back. This will leave a roughened surface which can be improved by using a finer grade of emery paper.

Now dissolve 3 oz. of gelatine in 1 oz. of water, add 1 oz. of albumen, and then a few drops of salicylic acid to act as a preservative. The albumen may be made by beating up the whites of eggs. This thick solution is lightly smeared on to the roughened surface of the paper, care being taken not to leave streaks, and for this reason either a soft wad of cotton or a small camel-hair brush should be used. The result is a new surface on the back of the print, smooth and finished as before. Now the print is ready for making the negative, though should it not be sufficiently translucent, apply vaseline, Canada balsam, or a mixture of three parts of paraffin wax and* 1 part of naptha, gently heated until dissolved; rub this in until none remains on the surface, and if the wax solution is employed, the paper should then be slightly heated, placed between blotting papers for a few hours, and rubbed again with a clean cloth to take off the surface oil. The illustration may then be placed in a reghlar printing frame, which is to be taken into a dark-room and a sensitive plate of proper size placed over it, film side down, as in making a print. The exposure may be determined easily. One seeond a foot or so from a Welsbach burner is usually found to be sufficient for the least transparent illustration. The plate maybe developed in. the usual way, or a special developer giving great vigor may. be used.