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Updated: May 17, 2025
A. Upon well formed railways with carriages of good construction, the average tractive force required for low speeds is about 7-1/2 lbs. per ton, or 1/300th of the load, though in some experimental cases, where particular care was taken to obtain a favorable result, the tractive force has been reduced as low as 1/500th of the load.
Since now, according to his chronology, the year 1,540 was the 5,500th year of the world, the end was bound to be at hand nay, was already overdue when his little book appeared in 1541. Yet, whatever were his views on this point, he never, like so many others, allowed himself to be drawn by such hopes and desires into illusions dangerous in practice.
A. I did not state that the resistance to traction was 1/500th of the weight upon an average to which condition the answer given to a previous question must be understood to apply but I stated that the average traction was about 1/300th of the load, which nearly agrees with my former statement.
Ten years after its first performance it was revised to fit the schemes of the Grand Opera, and brought forward under the new auspices on March 3, 1869. Mlle. Christine Nilsson was the new Marguerite. No opera has since equalled the popularity of "Faust" in Paris. Twenty-eight years after its first performance, Gounod was privileged to join his friends in a celebration of its 500th representation.
How then can the tractive resistance of locomotives at low speeds, which you say is entirely made up of friction, be so little as 1/500th. of the weight?
But my friend Westby reckoned the future more accurately than I did, for within nine years after, this price was hardly the 500th part of the value. To cap the whole tale, the lot was, I think, in the hands of Government from having been abandoned by the original buyer, who had forfeited his deposit rather than complete his supposed bad bargain.
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