Magic; stage illusions and scientific diversions, including trick photography (1897)
Hopkins, Albert A. (Albert Allis), 1869-1939, Evans, Henry Ridgely, b. 1861 · London : Low · leaf 427
pera glass which may be new to someof our readers, although the principle involved is very old. One tube of theopera glass is constructed in the ordinary manner, being provided Avith lenses,while the other tube is arranged to give a view of any object at right angles tothe line of vision of the… … A THK K OIKHA (iF.ASS. MISCELLANEOUS TRICKS OF AN AMUSING NATURE. 413 cut away, and a mirror is inserted at an angle in the tube. When the observerwishes to use the trick ghiss at short range/ he covers up a portion of theopening in the tube with his fingers, but at longer range this precaution…
Magic tricks
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