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Sept., 1936] A 13.6-MM. SUPER-HIGH-INTENSITY CARBON
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intrinsic brilliancy compared with the brilliancy at the center has decreased to 69 per cent for the regular carbon at 130 amperes, but only to 82 per cent for the super-carbon at 180 amperes. This flatness of the intrinsic brilliancy curve of this new carbon is accentuated at the lower current densities. At 160 amperes the intrinsic brilliancy at the center of the crater is a little lower than that of the regular carbon at 130 amperes, but is considerably higher at the sides of the crater. The total crater diameter increases with increasing current. The significance of this difference in the intrinsic brilliancy distribution becomes apparent upon comparing magnified images of the
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FIG. 1. Distribution of intrinsic brilliancy across crater face of regular and super 13.6-mm. high-intensity carbons.
crater face of the regular carbon and of the super-carbon. With the regular carbon there is a noticeable change in the color of the light near the edge of the crater, where the incandescent shell is the predominating light-giving material. With the super-carbon, apparently, the incandescent gases fill the crater more completely, resulting in much less change of color near the edge of the crater and a greater diameter where the gases themselves form the principal source of light.
These intrinsic brilliancy curves indicate that the new carbon when burned at its rated current should give a higher light and more uni