A WEEKLY JOURNAL OF PRACTICAL INFORMATION IN ART, SCIENCE, MECHANICS, CHEMISTRY AND MANUFACTURES j SINGLE COPIES SIX CENTS. NEW YORK, FEBRUARY 28, 1863. VOL. VIII.—NO. 9. 1 '$3 PER ANNUM—IN ADVANCE. (NEW SERIES.) ' COMSTOCK'S PATENT EOTAEY SPADER. Improved Eotary Spader. The strap, d, attached to… … of the cam, and has an arm, b, tures, e, in the face of the cam jointed to the upper end, which wheel are made for convenience of access in adjusting the arm, A, so that it is kept up to the lug, against is curved around the periphery of the cam, as shown the forks and the shafts in place. which it…
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