naccuracy, I concluded to have a cross-piece, whose length is more than twice A CURIOUS ARCHED TREE, make a simple apparatus for pulling-strength testing the width of the apparatus, bolted to their lower ends John S. Welter, of Upper Sandusky, Ohio, sends us involving the lever principle. The… … weight weighs 16 pounds. The resistance AN ARCHED TREE OVER AN OHIO ROAD. be indicated. It is unrolled automatically by a friction roller arrangement mounted be- capacity of the lever varies from 50 to 210 in the accompanying cut. It. is essentially a third- pounds, and the arm is graduated to…
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