Soap Bubbles
and the Forces which Mould Them
Forfatter: F. R. S., A. R. S. M., C. V. Boys
År: 1890
Serie: Romance of Science Series
Sted: London
Sider: 178
UDK: 532
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THE FORCES WHICH MOULD THEM. 171
after withdrawing the pipe to blow more air
or gas into either the inner or the outer bubble,
it is not safe after inserting the pipe again to
begin to blow at once; the film which is now
stretched across the mouth of the pipe will
probably become a third bubble, and this, under
the circumstances, is almost certain to cause a
failure. An instantaneous withdrawal of the air
destroys this film by drawing it into the pipe.
Air or gas may then be blown without danger.
If the same experiment is performed upon
a light ring with cotton and paper attached,
the left hand will be occupied in holding this
ring, and then the gas must be controlled by
the foot, or by a friend. The light ring
should be quite two inches in diameter. If,
when the inner bubble has begun to carry
away the ring, &c., the paper is caught hold
of, it is possible, by a judicious pull, to cause
the two bubbles to leave the ring and so
escape into the air one inside the other. For
this purpose the smallest ring that will carry
the paper should be used. With larger rings
the same effect may be produced by inclining
the ring, and so allowing the outer bubble to
peel off, or by placing the mouth of the pipe