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Page 166 The Educational Screen Your inquiries for VICTOR silent and sound 16mm. Projectors requested. Special discounts to schools We also make a spe- cialty of 16 mm. titles A postcard will place your name on our mailing list J. C. HAILE & SONS 215 WALNUT ST. CINCINNATI, OHIO types. Some were drawn on clear glass or clear lumerith with Scarborite black. These gave ex- cellent results in blue prints. Others were drawn on etched glass or etched lumerith. These, due to the diffusion of light, needed longer exposures and did not give such sharp results as the former, yet they were easily readable. The slides colored with Scarborite colors gave varying results, for, due to the different transparency of the various colors, the shading on the blue print did not correspond to the color tones of the actual slide; yet there was no difficulty in recognizing the details of these slides, so we found them of value. This method of recording lantern slides has many advantages. The slides can actually be seen without danger of breakage from unnecessary handling, and the cards take up much less space than the same number of slides. Extra copies of the blue prints can be made to use in illustrating papers, and as a means of testing the students' mas- tery of the subject. Duplicate files of slides for class room and library may be made so that the library, too, may have a complete, visible record of the slides in use in the school. Of course the technique of making the blue prints can easily be improved and the procedure speeded up, yet by the crude method described the students themselves get practice in making the prints, and the interest aroused in them is well worthwhile. The Motion Picture in C.C.C. Camps (Continued from page 155) gram to carry out the dominant aims of the educa- tional activities of the camps, as outlined in said Handbook. The program that could be developed for the camps might be enlarged to a great new adult edu- cational system for those outside the camps. Com- missioner Zook sounds this keynote in February School Life: "I look upon the CCC educational program as one which may prove of the greatest significance in the expansion of adult education. If the con- servation camps continue we may be able to de- velop a program which will be a new departure in Announcing the DeVry Theatre Sound Unit DeVry's Crowning Achievement of 21 years of manufacturing motion picture equipment Arc or Incandescent Light — A. C. or D. C. Radical Improvements in Engineering Design 1. SILENT CHAIN DRIVE throughout, insuring long wear. No meshed gears. 2. REAR BARREL SHUTTER—giving more illumi- nation. No flicker. Forced cooling at aperture. 3. FRAMING—straight pull from aperture to in- termittent. 4. CONSTRUCTION—amazingly simplified. Many less parts -— instant interchangeability. Herman A. DeVry, Inc. 1111 Center St., Chicago