n collapse, or by vigorous blowing may just be kept in- ‘The true nature ofa liquid film iscomparableto that out into the most elegant shapes, Fig. 9, reminding us flated. The blast fromthe hole is sometimes enough to of a perfectly elastic and tightly stretched membrane. of the iridescent glass… … end of the glass tube may be dipped into water, when Again attaching a bubble to a ring, the air in it can the depression will show the pressure, Fig. 3. It will be drawn out by inverting the mouth of the pipe until, be but a small fraction of an inch. on pulling away the pipe, a lenticular bubble…
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