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. 163
glass, may either be fastened to a heavy foot,
in which case a side tube must be joined to it,
as in Fig. 47, or it may be open at both ends
and be held in a clamp. It is well to put a
cone of card-board on the open end (Fig. 48),
if the sound is to be heard by many at a time.
If the experimenter alone wishes to hear as
well as possible when faint sounds are pro-
duced, he should carry a piece of smooth india-
rubber tube about half an inch in diameter
from the open end to his ear. This, however,
would nearly deafen him with such loud noises
as the tick of a watch.
Bubbles and Ether.
Experiments with ether must be performed
with great care, because, like the bisulphide of
carbon, it is dangerously inflammable. The
bottle of ether must never be brought near
a light. If a large quantity is spilled, the
heavy vapour is apt to run along the floor and
ignite at a fire, even on the other side of a
room. Any vessel may be filled with the
vapour of ether by merely pouring the liquid
upon a piece of blotting-paper reaching up to