Preservation of Drawings on Litho-Stones.—

Herr Fred. Sandtner, Copenhagen, has published an important article in the Œster-Ungar Buchdrucker-Zeitung, in which he describes a process by which originals may he reproduced after a lapse of years. In the first place, a good negative is required; to obtain which, an impression with solid black ink is made on good transfer-paper, and at once transferred upon a white gelatine surface. The gelatine sheet is mounted on a drawing-board, and with a broad and soft brush carefully covered with a solution of aniline brown or black, which must not be streaky; when dry, a second coat must be given, or the aniline may be poured on the transfer, making an even layer of color. It is necessary that the solution be clear and transparent, and absorb the light. When it is dry, wash off the printing-ink with a few drops of turpentine, and a small tuft of clean cotton. The transfer may now be taken from the board and should show a beautiful negative, perfect in its minutest detail. It may be preserved for any length of time between the leaves of a book, but will keep better if varnished on both sides with white turpentine varnish to which a little siccative has been added. When an impression is required from the negative, it is obtained by photo-lithography. The results are so good, that the inventor suggests that type-composition be preserved in the same way. All that is required is to take a sharp impression on transfer-paper, transfer it to gelatine, and prepare the negative. In this way, the photo-lithographer, with a very limited supply of type, might set an extensive work, print it cheaply it in a litho-press—and keep the whole thing standing.