The ultra-violet and visible transmission of various colored glasses. . ultra-violet and in the visibleregion there is considerable spread, enhancing the difficulty ofmaking photometric observations for a considerable range. is a print from a negative taken with the spark length parallelto the slit (vertical spark). The spectra here make contactthroughout their whole length, and the ease and accuracy ofdetermining points of equal density are greatly increased. Several other minor changes have been made. Brass rods mm in diameter have been substituted for the aluminum onesused b
The ultra-violet and visible transmission of various colored glasses. . ultra-violet and in the visibleregion there is considerable spread, enhancing the difficulty ofmaking photometric observations for a considerable range. is a print from a negative taken with the spark length parallelto the slit (vertical spark). The spectra here make contactthroughout their whole length, and the ease and accuracy ofdetermining points of equal density are greatly increased. Several other minor changes have been made. Brass rods mm in diameter have been substituted for the aluminum onesused by Howe, as the former do not disintegrate so fast under themechanical shock of the spark. The gap under water is generallyabout cm, so that there are no lines superposed on the con-tinuous spectrum. This necessitates the photographing of aknown spectrum (aluminum spark in air) at least twice on eachplate. The spark is placed directly in front of the slit and can beswung out of the way while not in use. 17 Loc. Bureau of Standards Technologic Paper No. 148. Fig. 24.—Paranitrosodimethylaniline, g per cubic centimeter of distilledwater, 1 cm layer, February 24, 1917, K. S. G. at Cornell University
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernatio, bookyear1919
