Popular Science Mojithly 



417 



COATED SIDE IN CON 

 GREEN SENSITIV 

 RED SENSITIVE 

 PLATE HOLOEIT 

 PRESSURE SPRll 

 REFLECTC 



Is This Actual Color Photography 

 at Last? 



SIXCE the discovery of the won- 

 ders of the camera a hundred 

 years ago, the instrument has done 

 some marvelous work, but it has al- 

 ways been regarded as incomplete in 

 that it was not capable of producing 

 a print in which the colors of nature 

 would appear. Some few years ago 

 the greatest step in this direction was 

 made by Frederick E. Ives, of Phila- 

 delphia, who succeeded in get- 

 ting three impressions on glass 

 and, when superposed and 

 backed by a light, these three, 

 each of a different color, 

 blended together so that all the 

 tints of nature were repro- 

 duced accurately. This trio 

 could be placed in a lantern and 

 the picture projected in all its 

 glory of color on the screen. 

 Utilizing the same principle it 

 was found possible to make ex- 

 cellent press prints in color, but a photo- 

 graphic print in color was not achieved 

 until recently, when Mr. Ives succeeded 

 in devising a new camera by which it is 

 possible to deliver a picture, entirely the 

 product of the camera, in which are 

 shown all the tints and colors of the 

 original object or model. 



The in\-ention consists primarily of 

 an arrangement by which three plates 

 are exposed in the camera at the same 

 instant and each one under a screen 

 which sifts out all the rays except 

 those desired. For instance, one plate 

 takes a record of all the yellow rays, 

 another the red rays and the third the 

 blue rays. These plates are developed 

 in the same manner as the usual photo- 

 graphic plates (differing only in the fact 

 that they are extremely sensitive to 

 color) ; then a print is made from each 

 negative, a special printing frame being 

 resorted to by which the three prints are 

 made simultaneously. One of these prints 

 is made on a piece of blue print paper. 



and the other two are made on film 

 which has been sensitized with bichro- 

 mate of potash, which makes an im- 

 age slightly in relief. The film which 

 was made under a red screen is dyed 

 red and that which was made under 

 the yellow screen is dyed yellow and 

 then the three are held together, with 

 the blue print on the bottom. When 

 they are properly registered the colors 

 are blended together and a perfect pic- 

 ture in real color is presented. xA.fter 



BLUE SENSITIVE PLATE 



The principles of construction of a camera which 



exposes three plates simultaneously. From them a 



photograph in natural colors can be made 



being secured at one edge, these sheets 

 are given a chemical bath and then 

 pressed together so that they form 

 one piece. The process is no more com- 

 plex than that of making an ordinary 

 photograph. There are a few more op- 

 erations which are more than com- 

 for by the beautiful results 



pensated 

 obtained. 



A Brazilian Snake Farm 



ONE of the queerest farms in the 

 world Is the snake farm at Butan- 

 tan, In the State of Sao Paulo, Brazil, 

 where thousands of poisonous snakes of 

 all varieties are kept In captivity. The 

 venom Is removed from these reptiles 

 and Injected Into the veins of a number 

 of young horses kept for that purpose. 

 Thousands of tubes of serum are dis- 

 tributed from this Institution every year, 

 and much has been done to reduce the 

 high mortality rate resulting from snake- 

 bites. 



If you want further information about the subjects which are taken up in 

 the Popular Science Monthly, write to our Readers' Service Department. We 

 will gladly furnish, free of charge, names of manufacturers of devices described 

 and illustrated. 



