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Scientific American, Vol. 44, No. 13 (March 1881) (1881)

leaf 4

An illustration from Scientific American, Vol. 44, No. 13 (March 1881), 1881, leaf 4
distance so that its located under the rear pavement, remote from the press D, in the usual manner of such gates. It is well under- point will engage with the catch formed on the bracket, C, room, thus preventing the heat and dust from entering the stood by those familiar with such devices that the… … rod to a corresponding arm of a graphed cards and other devices for similar mechanism on the second gate. wheel forces the trip rod entirely down almost instan- framing. These cards, as received from the printing de- This gate was recently patented by Mr. Nathan H. Long, taneously, and retains, it…

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