Page:Popular Science Monthly Volume 88.djvu/880

 852

��Popular Science Monthly

��A Device for Numbering Photographic Plates and Films

A PLATE and film-numbering ma- chine invented by John R. Stephen- son of Pullman, W'ashinfjton. makes it

���hold the photographic plate in the proper position over the numbering machine. This makes it easy to operate in the dark, as it furnishes its own light for handling and the guide pieces insure proper posi- tioning of the photographic plate or film to be numbered. It is possible to print the l^hotographs either in white or in black. If transparent numbering strips having opaque figures are employed, small opaque surfaces, with transparent num- erals appearing therein will be plainly legible when the dry plate or film is developed. If opaque numbering str-ips having transparent numerals are em- ployed, opaque fig- ures will be printed.

��This simple device, reseai- bling in appearance a small adding machine, enables the photographer, professional or amateur, to preserve an ac- curate record of his photo- graphic plates and films

possible for the photogra- pher, professional or ama- teur, to keep an accurate record of his photographic plates and films. In opera- tion and appearance the ma- chine re.seml)les a small adding machine. It prints any desired number on the light-sensitive surface of the plate or fihii (which after develop- ment is termed a negative) by the trans- mission of light through transparent figures arranged on opaque numbering strips. These strips bear the numbers I — 9 consecutively and o.

The machine has a slot in which the point of a pencil may be pressed and the strip slid along in its groove in the numbering machine until the desired figure is positioned over the opening in the table member of the machine, through which the light passes to print the numeral on a photographic plate or film, resting on the table of the machine. The rays from an electric flashlight under the table member are reflected by a slanting mirror up through the open- ing and through the figures on the num- bering strips of the machine, to transfer the numbers to the photographic plate or film.

Guide pieces on the table member

���Submitting Photo- graphs for the Lon- don Exhibition

THE sixty-first an- nual exhibition of the Royal Photo- graphic Society will be held as usual in August and Septem- ber of this year. Mr. C. E. K. Mees of the Eastman Kodak Com- i:)any has been ap-

���Transparent numerals on a small opaque area or opaque numerals can be trans- ferred to each negative

pointed one of the judges in the scien- tific section of the exhibition and he will receive photographs from exhibitors.

�� �