The Educational screen (c1922-c1956])

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Page 4 The Educational Screen 20,000 Pieces of Keystone Etched Glass for the Schools of Chicago This was one order, received from the Purchasing Department of the Board of Education of Chicago in December Keystone Etched Glass Was Selected over All Competitors as the Best Etched Glass Available for Making Attractive, Colorful Handmade Lantern Slides. Keystone Handmade Lantern Slide Materials Are of Superior Quality They Make Possible Unusually Attractive Hand- made Lantern Slides Keystone Etched Glass The Finest Obtainable . . . Even Satin Finish, Obtained by Mud-grinding Process . . . Per- mits Clear Projection. . Keystone Cover Glass Clear White Photo Glass . . . Annealed So That It Will Not Crack Readily. Keystone Lantern-Slide Crayons Make Attractive, Colorful Pictures . . . The Only Crayons or Pencils Made Solely for This Purpose. Keystone Lantern-Slide Inks Heatproof against Cracking or Fading . . . Valuable in Touching Up Crayon Slides Where High Color Is Desired. Keystone Cellophane and Carbon Paper The Best Obtainable for Typewritten Slides. Send for Our 1938 Booklet on the Making of Handmade Lantern Slides. « Keystone View Company MEADVILLE, PENNA.