5 Equispaced circles No. 6 Circular zone plate No. 7 Sphere projection No. 8 Cylinder projection 2 pieces of woven screen and a booklet "The Science of Moire Patterns" by Gerald Oster, 2nd ed, Edmund ...

A fabric screen that rolls up from a cylinder on a tripod base or rolls down from a cylinder attached to the ceiling. There is a wide variety of screens for front-projection TVs and data projectors.