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 bv 

 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. 



