Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 357
in the neck. Instead of a cork,the experiment may be successfully tried witha small ball of pith, or with one of paper. THE MAGIC TRIANGLE. A very interesting experiment may be per-formed as follows. With a wet lead-pencilpoint draw on a piece of thick paper a triangle— whether the sides are equal… … of water on the swimming sheet of paper.(The water will not extend beyond the wetlines of the drawing.) Now, taking a pin or aneedle, or any thin, smooth, sharp-pointed in-strument, dip its point into this triangular basin,anywhere but at its center of area — say, verynearly at one of the angles.…
Children's literature
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