ur correspondent will attach the thread to any conve- the appearance of having made one half revolution on arriv revolves once on its own axis, it would revolve twice on its nient point upon the periphery of the wheel, B, and allow the ng at B. This is my explanation, and I think it is correct. own… … Let us take, the diagram of L. M. once more, with this Messrs. Editors :—Through a singular coincidence, at the as the quarter sections on the two wheels will show. difference only that we mark the axis with a small arrow to very time you published L.M.'s diagram of the moving wheel Sandy Hook,…
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