Johnson, Gaylord · New York, The Macmillan company · leaf 89
going to startthe heavy plumb-bob swinging back and forth atright angles to the ruler. Then Paul will quicklyturn the ruler so that it points straight out awayfrom his hips instead of being parallel to them as itis now. Then all of you watch the plumb-bob andsee what it does. The bob was set… … FOURTH REEL 75 The ruler was now just at right angles to theposition it was in before. The children watched the plumb-bob closely. It isnt doing anything different!cried Betty,it just keeps on swinging back and forth betweenPauls legs. No, said Uncle Henry, the pendulum willkeep on swinging in just…
Astronomy
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