adopted with good results. Let us take the matter of measurement for instance. In too many work shops the only reliance for proper fitting work is placed on an old illegible greasy shaky-jointed smooth-ended wooden two-foot rule ; which is about as useful for measuring purposes as so many inches of a broomstick. With this valuable aid the old IMPROVING NAVIGABLE RIVERS. MUNN & COMPANY Editors and Proprietors. PUBLISHED WEAKLY, scientific american, 1863-08-08
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