h side of the lever, c, is hinged a brace, e, ing William Scarlett, at Aurora, Illinois. For ditch plowing, two plows are arranged on one beam, as shown at E, and this beam is substituted for the rear ends of these braces being hinged to the up- * ■ - - Mr. Wilkinson's Letter. one of the beams in… … get the " leverage" of the American Patent Agen- long spokes. It is a strik- cy, July 30, 1861, and COOK'S SELF-CLEANING HARROW. ing evidence of the gen- further information in eral advance in knowledge of mechanical princi- relation to it may be obtained by addressing the in- c, is raised, the…
Patents · Combination · Iron · Purpose · Claim · Manner · Purpose set · India rubber · Steam wagon · Scientific American · Address munn · Steam cut · Patent office · Purposes set · Boiler pressure · Soft metal
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