Photometrical Measurements And Manual for the General Practice of Photometry Wi
Photometrical Measurements And Manual for the General Practice of Photometry Wi
Wilbur M Wilbur Morris Stine
The book Photometrical Measurements And Manual for the General Practice of Photometry Wi was written by author Wilbur M Wilbur Morris Stine Here you can read free online of Photometrical Measurements And Manual for the General Practice of Photometry Wi book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Photometrical Measurements And Manual for the General Practice of Photometry Wi a good or bad book?
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axis. In the illustrations a curve for the distribution of the light in a vertical plane is shown in Figure 50, and both the 198 PHOTOMETRIC AL MEASUREMENTS shape and position of the filament are indicated ; v while the dis- tribution in the horizontal plane, of filaments whose shape is sketched in each case, is given in Figures 51 and 52. FIG. 52. The intensity at the tip of the lamp is low, because the area of the filament projecting in this direction is small ; the base entirely screens all ...light in its direction. * THE PHOTOMETER ROOM AND ITS APPARATUS 205. The size of the room in case no flames are used pho- tometrically is of little consequence; it may be just large enough to accommodate the apparatus and leave space for operating it, due allowance being made for proper ventilation. When, as must be the case in most laboratories, flames are photometered, a large room is a necessity in order to insure * An admirable paper by Liebenthal on " The Light Distribution and the Photometry of the Incandescent Lamp, " may be found in Zeitschrift fur Instrumentenkunde, 19, 1899, pages 193 and 225.
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