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. 75
and, as the diagram shows, these bubble curves
are at first wavy (C), then they become straight
when a cylinder is formed (D), then they be-
come wavy again (E and F), and at last, when
the cutting plane, i. e. the black line in the
upper figure, passes through the vertex of the
cone the waves become a series of semicircles,
indicating the ordinary spherical soap-bubble.
Now if the cone is inclined ever so little more a
new shape of section is seen (G), and this being
rolled, draws a curious curve with a loop in it;
but how this is so it would take too long to
explain. It would also take too long to trace
the further positions of the cone, and to trace
the corresponding sections and bubble curves
got by rolling them. Careful inspection of the
diagram may be sufficient to enable you to
work out for yourselves what will happen in all
cases. I should explain that the bubble sur-
faces are obtained by spinning the dotted lines
about the straight line in the lower part of
Fig.. 31 as an axis.
As you will soon find out if you try, you
cannot make with a soap-bubble a great length
of any of these curves at one time, but you
may get pieces of any of them with no more