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The magician's own book, or The whole art of conjuring (1862)
Arnold, George, 1834-1865, Cahill, Frank · New York, Dick & Fitzgerald · leaf 197
uld be very difficult, and would require geometricalreasoning of a lengthened kind, to show why this particularform of construction should lead t© such results. 180 THE magicians OWN BOOK. THE COSMORAMA.The principle upon which the cosmorama is formed is sosimple, that any person may easily fit up… … To absorb all the rays of lip^ht bnt those necesfiary for see-ing the picture, a squared frame of wood blackened on theinside is placed between the lens and the picture. The pic-ture may be hang in a large box having a light coming inupon it from above, or in a small closet illuminated in thesame…Magic tricks
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