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Dioptrical Paradox








Construct a machine similar to that in Fig. 25. Its effect will be,
that a print, or an ornamented drawing, with any object, such as an
ace of diamonds, &c. in the centre F, will be seen as an ace of clubs
when placed in the machine, and viewed through a single plane glass
only, contained in the tube E. The glass in the tube F, which produces
this surprising change, is somewhat on the principle of the common
multiplying glass, as represented at G, which, by the number of its
inclined surfaces, and from the refractive power of the rays
proceeding from the objects placed before it shows it in a multiplied
state. The only difference is, that the sides of this glass are flat,
and diverge upwards from the base to a point in the axis of the glass
like a cone; it has six sides, and each side, from its angular
position to the eye, has the property of refracting from the border of
the print F, such a portion of it (designedly placed there) as will
make a part in the composition of the figure to be represented; for
the hexagonal and conical figure of this glass prevents any part of
the ace of diamonds being seen; consequently the ace of clubs being
previously and mechanically drawn in the circle of refraction in six
different parts of the border, at 1, 2, 3, 4, 5, 6, and artfully
disguised in the ornamental border, by blending them with it, the
glass in the tube at E will change the appearance of the ace of
diamonds, F, into the ace of clubs, G. In the same manner many other
prints undergo similar changes, according to the will of an ingenious
draughtsman who may design them. The figure of the glass is shown at
H.





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