Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 162
tter, and the force of gravity doesnot interfere with our experimenting. It is to be observed,too, that in the bubbles and films thereis an outside and an inside surface, eachunder tension. In an inflated toy balloon the rubberis under tension. This is shown bypricking with a pin or untying… … Fio. 178.—Soap-buhble blow-ing out a candle.
Physics
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