Page:Popular Science Monthly Volume 88.djvu/445

 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.

�� �