nds and called powers. of the arms. in regard to mine La Motte, he says the " Granite is every- An even length lever divides or multiplies by two. where near the surface," and therefore intimates that the The excess which gtves motion is the same in all; and mo- mines there are about exhausted.… … Explanation Wanted. Above is a diagram of the " VerticalMultiplier;" the arrow represented by 1, and the 100 is moved in a radius repre- Messrs. Editors :— I would like some one of your nu- heads show the direction in which the levers are moving sented by 3 merous correspondents to give some…
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