PAGE PROF. JOHN TYNDALL. SCREEN PHOTOGRAPHY IN COLORS. optical systems are illuminated by three separate jets of lime light or instead of lime light the electric are light may be used. To project the three separate positive pictures in a lantern he has a square light wood frame divided into four compartments or four apertures and he uses three of these apertures for holding the plates and his method of aligning the respective plates with the lantern is somewhat ingenious and practical. One of the most difficult problems connected with this system of projecting the color pictures upon the screen is to make them exactly coincide and Mr. Ives secures that in one division of the lantern slide frame and places it in the lantern ; he then takes the second plate and places that in the second division of the frame and then applies his adjusting attachment. One person stands at the lantern and one at the screen. The operator at the lantern then operates the adjusting screw until the position of the plate is such that the person at the screen decides that the two for use and will always register accurately upon the screen. The positions of the pictures in the lantern frame correspond to the colored screens through which they were originally made. As a result of this method it is a very simple matter to place picture after picture in the lantern and run them through the same as an ordinary lantern and few slides made for color projection he has been able to produce a larger number. Having thus perfected the minute detail of adjusting the pictures and the apparatus for showing them it was very easy and simple to project them on the screen and the marvelous beauty and delicacy of the combined colors in showing the various grades of color in the pictures was surprising and most pleasing and gave one a more adequate idea of the beauty of the landscape than an ordinary monotone photograph. In pictures of autumn foliage the delicate reds and yel lows would appear to great advantage
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