Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 230
of wood, sliding upon each other, andheld together in any position by a clamp. Thefront surface of the rod is graduated to hun-dredths of a foot up to 6£ feet. The target slides along the front of the rod,and is held in place by two springs which pressupon the sides of the rod. It has a…
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