The Educational screen (c1922-c1956])

254 The Educational Screen f51ill»willliiiiiiiiiiini«iiiiiiniinm«»inMiiiiniiiiiinmi *iiiiiiiiiiiiiiiitiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiuiiiiii*iiiiiiiiiiiiiiiiiiiiniiiMiMiiiaiiiiiiiiMiiiiiiiiiiiiiiii)iiiii(ihiiii AMONG THE PRODUCERS Where the commercial firms — whose activities have an important bearing on progress in the visual field— I are free to tell their story in their own words. The Educational Screen is glad to reprint here, within | necessary space limitations, such material as seems to have most informational and news value to our readers = I jHlinilltlMllltini (Iltlllllltll I II llinilllltl'llllitlllliliiillllllllllllltMllllllllllllllilllllllillllllllllilllllillllMlllllMIIIIIMIIIItllltllllllllllllMtllMMllllllllllllll iMIIIIIIIlltlllllllll MlllQ A New Stereopticon with Several New and Distinct Features By A. O. Potter SPENCER Lens Company have just introduced their Model B Delineascope, which more nearly fills the need of the lecture room than any other type of lantern. It has been made especially for the busy teacher who wants occasionally to use lantern slides, point out features in them, run the lantern himself, and at all times face his class. It is arranged so that the picture may be thrown on the screen above the blackboard, thereby enabling the lecturer to make drawings to illustrate his lecture without disturbing the lantern setup in any way whatever. To do this the screen must be tipped forward to prevent keystoning of the picture. In this position an ordinary screen would sag, so a special screen has been made with a solid back and framed, making it just as easy to hang as a picture. Every possible inconvenience in the usual method of projection has been thought of and, so far as possible, eliminated. The instrument is equipped with a lens of large diameter, which throws an abundance of light on the screen, thereby eliminating the necessity of darkening the room. The usual procedure is for the lecturer to place the lantern in position before beginning, if it is not already there, and to focus the lens. When he is ready to use a slide, he snaps on the light, places the slide on the table of the instrument, in a horizontal position, and the picture appears on the screen. He sees the slide right side up and right side to, and can, with the aid of a pencil or any sharp instrument, point to any part of it, with the assurance that the image of his pointer will be seen on the screen, and what is most important, he has all the time been facing his class. The accompanying illustration shows a lecturer using the lantern and a true image of a pointer on the screen. This picture has not been retouched, and in spite of the fact that there was a large window each side of the blackboard and four on the opposite side of the room, with no shades, and on a bright day, the picture was plainly visible to all of the ill pupils that the room accommodated. Another illustration is given, showing the general construction of the instrument. When one considers the advantageous features of this lantern, it seems to remove practically all of the usual objections to the use of a lantern in the classroom. No darkening the room, no getting ready, no turning your back to the class lo point to the picture, no signaling to operator, and the blackboard is always free for use. No wonder it was named The Lecture Table Delineascope. An attractive circular, giving a more detailed description of this new instrument, may be had by writing to Spencer Lens Co. Buffalo, N. Y. A Visual Education Handbook "The Schoolman's Handbook of Visual Education" by Louis Walton Sipley, recently published by James C. Muir and Company, is the title of a helpful booklet which describes, with illustrations, the four fundamental types of projection apparatus — filmslide, glass-slide, opaque and mo