With the pack well squared in the left hand face down, bring the right hand over it, thumb at the rear, fingers on the outer end. Make a motion of squaring the ends and at the same time press the fingers back a little making the ends of the deck s... Read more of Double Lift at Card Trick.ca

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The Travelling Of Sound Experimentally Proved

There is probably no substance which is not in some measure a
conductor of sound; but sound is much enfeebled by passing from one
medium to another. If a man, stopping one of his ears with his finger,
stop the other also by pressing it against the end of a long stick,
and a watch be applied to the opposite end of the stick, or a piece of
timber, be it ever so long, the beating of the watch will be
distinctly heard; whereas, in the usual way, it can scarcely be heard
at the distance of fifteen or eighteen feet. The same effect will take
place if he stops both his ears with his hands, and rest his teeth,
his temple, or the gristly part of one of his ears against the end of
a stick. Instead of a watch, a gentle scratch may be made at one end
of a pole or rod, and the person who keeps his ear in close contact
with the other end of the pole, will hear it very plainly. Thus,
persons who are dull of hearing, may, by applying their teeth to some
part of a harpsichord, or other sounding body, hear the sound much
better than otherwise.

If a person tie a strip of flannel about a yard long, round a poker,
then press with his thumbs and fingers the ends of the flannel into
his ears, while he swings the poker against an iron fender, he will
hear a sound very like that of a large church bell.

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