our 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 atB. This is my explanation, and I think it is correct. own… … around the fixed wheel and it has made only one revolution Let us take, the diagram of L. M. once more, with this Messrs. Eprrors :—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…
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