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. 71
first upright
(A),then being
gradually tilted
over into the
positions that
I have speci-
fied. The black
line in the
upper part of
the diagram
shows where
the cone is cut
through, and
the shaded area
below shows
the true shape
of these shad-
ows, or pieces
cut off, which
are called sec-
tions. Now in
each of these
sections there
are either one
or two points,
each of which
Fig- 31-