mere power of gravity. Its path may be a circularroad formed of the inclined planes. But, to avoid a cir-cuitous route, a double road ought to be made. The car-riage not having a retrograde motion on the inclined planes,a road to set out upon, and another to return by, are indis-pensable. I am… … It gives me much pleasure (says the writer) to observe thatyou notice scientific subjects; you are very right in so doing,as it will not only give variety, but add considerably to thevalue of your very useful miscellany. It is my humbleopinion that such a procedure is infinitely better than…
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