Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 472
least two different speeds—a slowone for penetration and a quicker one for the return movetnent.It has also lately come to my notice that some of theoriginal experiments made by Messrs. Hoopes & Town-send, a number of years ago, were based upon this principle,and that the large nuts penetrated… … Plate, T^5-iach steel (fullj.Punch, \\ inch (bevelled).Time, 15 seconds to penetrate.I hole. higher than those originally given. The reasons for thismay be many; possibly a little higher carbon steel, or alittle more resistance in the machine upon which they wereconducted, as compared to the…
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