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. l6j
Experiment with Internal Bubbles.
For these experiments, next to a good solu-
tion, the pipe is of the greatest importance.
A “ churchwarden ” is no use. A glass pipe
inch in diameter at the mouth is best.
If this is merely a tube bent near the end
through a right angle, moisture condensed in
the tube will in time run down and destroy
the bubble occasionally, which is very annoy-
ing in a difficult experiment. I have made
for myself the pipe of which Fig. 67 is a full
size representation, and I do not think that
it is possible to improve upon this. Those
who are not glass-blowers will be able, with
the help of cork, to make a pipe with a trap
as shown in Fig. 68, which is as good, except
in appearance and handiness.
In knocking bubbles together to show that
they do not touch, care must be taken to
avoid letting either bubble meet any projection
in the other, such as the wire ring, or a heavy-
drop of liquid. Either will instantly destroy
the two bubbles. There is also a limit to the
violence which may be used, which experience
will soon indicate.