From L. R. H., North Argyle, N.Y. — Will you please inform me what philosophical principle is involved in the fact that a long screw-driver will turn a screw with less power than a short one? Can you explain the phenomenon to an unphilosophical subscriber?
Answer.—Our correspondent, in asking his question, virtually asserts that, with a long screw-driver, more power can be applied to the head of a screw than with a short one. This fact has often been denied, yet we believe it to be well established. The difference in the lengths of the screw-drivers admits of a difference in the manner of using them, and this difference in the way of using accounts for the difference in the power exerted.