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. 139
is not so good as a gas-flame. The narrower
these tubes are, the higher will clean water be
observed to rise in them. To colour the
water, paints from a colour-box must not be
used. They are not liquid, and will clog the
very fine tubes. Some dye that will quite
dissolve (as sugar does) must be used. An
aniline dye, called soluble blue, does very well.
A little vinegar added may make the colour
last better.
Capillarity between Plates.
Two plates of flat glass, say three to five
inches square, are required. Provided they
are quite clean and well wetted there is no
difficulty. A little soap and hot water will
probably be sufficient to clean them.
Tears of Wine.
These are best seen at dessert in a glass
about half filled with port. A mixture of
from two to three parts of water, and one part
of spirits of wine containing a very little rosani-
line (a red aniline dye), to give it a nice colour,
may be used, if port is not available. A piece