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Although from earliest times wizards and conjurers have attempted to create illusions to impose upon the more credulous of their dupes, it was not until the great Robert Houdin devoted his attention to the matter that any real progress was made in the art. Yet such was the genius of Houdin that his inventions have hardly been superseded in the many years which have elapsed since his death, whilst in the greater number of cases his original plans have barely been improved upon.
Fig. 1.—The principle of reflection.
Having dealt with the subject of stage apparitions in the previous chapter, it is the intention here to describe and explain the best illusions in so simple a manner that, with the minimum of trouble, any amateur can construct the apparatus necessary for their production. The successful working of the performance depends entirely upon the skill of the exhibitors.
A great number of stage illusions are based upon the principle that a person looking into a mirror from any angle sees the reflection of objects at a similar angle from the opposite direction. This is borne out by [Fig. 1]. Supposing A, B to be the mirror, with the spectator standing at D, he will see the reflection of an object at E, the angle D, F, B being equal to the angle E, F, A.
A simple adaptation of this principle is seen in