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.
21
it well while hot to knock the paraffin out of
the holes. You can now see on the screen that
the holes, all except one or two, are open, and
that a common pin can be passed through
readily enough. This then is the apparatus.
Now if water has an elastic skin which it re-
readily; it ought
quires force to stretch, it ought not to run
through these holes very
not to be able to
get through at all
unless forced, be-
cause at each hole
the skin would
have to be stretch-
ed to allow the
water to get to the
other side. This
you understand is
only true if the water does not wet or really
touch the wire. Now to prevent the water
that I am going to pour in from striking the
bottom with so much force as to drive it
through, I have laid a small piece of paper
in the sieve, and am pouring the water on to
the paper, which breaks the fall (Fig. 5). I
have now poured in about half a tumbler of