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Scientific American, Vol. 94, No. 15 (1906) (1906)

leaf 7

An illustration from Scientific American, Vol. 94, No. 15 (1906), 1906, leaf 7
308 APRIL 14, 1900. … The major portion of those of marshmallow this apparatus the relief of the bottom is ob- A NOVEL PROFILE TRACER. or other similar material is made in molds. The tained, not merely by the determination of a millions of little speckled and glossy eggs which series of depth measurements necessarily a…

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