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Scientific American, Vol. 17, No. 2 (1867) (1867)

leaf 7

An illustration from Scientific American, Vol. 17, No. 2 (1867), 1867, leaf 7
t iron The diagonal longitudinal line across its face, from lower Platinum has been formed into coins, etc, by subject- which extends about half way up the sides of the blocks ; point to upver, is a right line on which a straight edge bears ing it in fine powder as obtained by chemical treat- these… … ples, and experience has proved that this cence. Gold and silver are not affected by the RIDER'S GEOMETRICAL PLOW. plow is an exccedingly easy working one. process. The soil will not adhere tothe mold board, oo and, as the plow itself is parallel with the be He would use resinous wood or wood…

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