. Annals of the New York Academy of Sciences. Science. 32 TROWBRIDGE. urements are 11 centimeters in width by centimeters in depth, while at the opposite end, at C, the casing is square, being X centimeters. Just back of the end C, the lower portion of the casing is en- larged by a half-cylinder or half-drum extension of 6 cms. radius, which was added so as to conform the shape of the casing to certain devices which comprise a part of the interior con- struction of the apparatus. The entire inside of the instrument, including all the brass parts, is painted a dead black. i), in fig
. Annals of the New York Academy of Sciences. Science. 32 TROWBRIDGE. urements are 11 centimeters in width by centimeters in depth, while at the opposite end, at C, the casing is square, being X centimeters. Just back of the end C, the lower portion of the casing is en- larged by a half-cylinder or half-drum extension of 6 cms. radius, which was added so as to conform the shape of the casing to certain devices which comprise a part of the interior con- struction of the apparatus. The entire inside of the instrument, including all the brass parts, is painted a dead black. i), in figs. 8 and 9, is a binocular eye-protector of patent leather, which is shaped to fit above the eyes, and has a black velvet cushion on the edge, marked B'. This cushion is added so as to prevent, as far as possible, all light from entering the instrument from around the edge of the eye-protector. It is made soft and elastic, in order that it may readily be made to follow the contour and set close to the face of the person using the instrument. At the opposite end from ^ is a brass screen holder, C, which measures centimeters, and is constructed to fit exactly into the end of the casing A. In this screen holder there is a circular aperture cms. in diameter, which is encircled by a thin ring of brass that extends .5 cms. outward from the main portion of the screen holder. A screen of black paper is placed over this opening, having on its inner side crystals of barium-plat- ino-cyanide (BaPtCy^ + 4Aq), tungate of calcium (CaWOJ, or n N. Fig. 9. Top View of the "X-Ray ;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York Academy of Sciences. New York, New York Academy of Sciences
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
