. Journal of applied microscopy and laboratory methods. ive merit of various photographic plates. The apparatus, asillustrated in Fig. 1, consists of a direct vision spectroscope so mounted in thefront board of an ordinary camera (with lenses removed) that the spectrum,when projected on the plate, will come in the center horizontally and at the topof the plate. The back of the camera is constructed in such manner as to allowof its being moved in the vertical plane, thus making it possible for one to makefour exposures on the same plate, and by so doing to make an accurate com-parison between t
. Journal of applied microscopy and laboratory methods. ive merit of various photographic plates. The apparatus, asillustrated in Fig. 1, consists of a direct vision spectroscope so mounted in thefront board of an ordinary camera (with lenses removed) that the spectrum,when projected on the plate, will come in the center horizontally and at the topof the plate. The back of the camera is constructed in such manner as to allowof its being moved in the vertical plane, thus making it possible for one to makefour exposures on the same plate, and by so doing to make an accurate com-parison between them. The plates examined may be grouped according to their degree of perfectionas follows: Group I—Characterized by a very high degree of sensitiveness a little above * F. L. Richardson. Journal of the Boston Society of Medical Sciences, S: 460-464. 1490 Journal of Applied Microscopy line D, falling oft abruptly on either end, and only slightly sensitive to thegreens and blues. Group II—Characterized by two distinct maxima—one a little above the. Fig. 1. Apparatus for making spectrograplis. A. Spectroscope. B. Back of camera, carrying screen and plate-holder. C. Supports upon which the back (B) may be moved. D. Color screen in color screen holder. D line, and the other in the blue-green,sensitiveness falls very considerably.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
