A Writing and Drawing Board suitable for Teaching Purposes.

摘要

20,668. Bzd·ch, I. Sept. 17. Drawing-slates.- Relates to writing and drawing boards of the kind consisting of a piece of ground glass or celluloid mounted in a frame and a copy which is inserted behind the ground glass or celluloid and kept in position by a piece of cardboard &c. attached to the frame. The copy 4 consists of a dark sheet with the lines, writing, or figures traced in light, preferably white, lines. A slit is provided in the frame 1 for the insertion of the copies. The backing 5, separated from the glass 2 by stops 15, may consist of slate or a second sheet of ground glass.