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Scientific American, Vol. 38, No. 19 (1878) (1878)

leaf 4

An illustration from Scientific American, Vol. 38, No. 19 (1878), 1878, leaf 4
n, and is hinged to | is elevated to the required height, the lens properly focused construction for saw mills. It is strongly made, and possess- the rim of the basin. It is made hollow, and of such a and the tissue in position, the shutter is set in motion by weight that as the water rises in the… … have yet known. ~ | : Last summer Secretary Evarts sent to our Ministers and freely escape. The lower surface of the valve is covered Consuls in various countries a circular of inquiry asking in- with leather, rubber, or similar material, to cause it to cover formation in regard to the conditions…

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