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remarked that in p:~ragraph (c) on p. 185, the Author implied that a stress of 5 tons per sqwre inch might be produced in the metal by :;L change of temperature of 60" F., allowing 1 ton per square inch for every Mr. Farr's allowances were rather under the mark in most cases, on the other hand the allowance required by the Indian Rules was a good deal in excess of what was necessary, and he w.oultl give ;tn instance which he thought bore out that view. He h ;~d recently

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