Catalogue of Optical Projection Apparatus. (September 1938)

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OPTICAL LANTERNS, ETC. Lantern Sheets A screen for lantern work may consist either of a linen sheet or a distempered canvas surface. The latter is by far the best, cannot be folded, but only roUed up. These canvas screens are therefore not very portable, and are chiefly used more or less as fixtures in lecture halls or churches. Prices and details of them are given on page 26. The linen sheets, on the other hand, can easily be packed up and put away in a bag; but the image on them is slightly less brilliant, as a percentage of the hght passes through them and is lost. These sheets must be well stretched either on a screen stand or to the walls or fixtures in the room. l741 Opaque Sheets, for showing the pictures on the sheet :— Constructed of Pine or Bamboo. These Stands are extremely light, and yet rigid; and are so arranged that the sheet can be stretched NEWTON & CO., 72 WIGMORE STREET, LONDON, W.l 25