2).
Of course, a regulator must be had for the vibrator; this can be
accomplished by bending a stout piece of copper wire as shown. The
connections and the base for setting up are shown in the figures.
--Contributed by J. T. R., Washington, D. C.
** Mechanical Trick With Cards [63]
The following mechanical card trick is easy to prepare and simple
to perform:
First, procure a new deck, and divide it into two piles, one
containing the red cards and the other the black ones, all cards
facing the same way. Take the red cards, square them up and place
in a vise. Then, with a plane, plane off the upper right hand
corner and lower left hand corner, as in Fig. 1, about 1/16 in.
Then take the black cards, square them up, and plane off about
1/16 in. on the upper left hand corner and lower right hand
corner, as in Fig. 2.
Next restore all the cards to one pack, taking care to have the
first card red, the next black, and so on, every alternate card
being the same color. Bend the pack so as to give some spring to
the cards, and by holding one thumb on the upper left-hand corner
[Illustration: Card Trick]
all the cards will appear red to the audience; place thumb in the
center at top of pack and they will appear mixed, red and black;
with thumb on upper right-hand corner all cards appear black.
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