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Scientific American, Vol. 93, No. 1 (1905) (1905)

leaf 9

An illustration from Scientific American, Vol. 93, No. 1 (1905), 1905, leaf 9
ing a total of the whole of the 6%. square miles occupied by the res- the Subway Superintendent, A. L. Merritt. over 54,000 candle power. From a photographic point ervoir, carrying out this cleaning operation until of view, on account of the great actinic quality of the s+ oe ______——_——_——" either… … high-water level. This be awarded for a good dike consists of an earth form of crane or hoist embankment, with an impervious concrete core wall, were nine banks of eight 55-inch mercury-vapor lamps provided with a simple and practical device which which is carried down to the solid rock and extends…

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