Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 145
Fig. 96. the needle. Now draw the needle up, little by little, through thefloating board until the point is reached at which the needle justvanishes from view, the line of sight being made at last as nearlyhorizontal as possible. Lift the board from the water, and note howmuch of the needle still…
Physics
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