Luckiesh, Matthew, b. 1883 · New York, D. Van Nostrand company · leaf 424
CERTAIN PHYSICAL ASPECTS AND DATA 391 luminant it is well to reduce these curves to luminosity values. If monochromatism is desired it is often ad- visable to combine two glasses which transmit a narrow region in common. 103. Blue. — Cobalt is the most common element used to impart a blue co or to… … Fig. 146. — Cobalt glasses. transmission of a deep red band as shown in 6 Co and 7 Co, Fig. 146. This red transmission can be utilized in isolating the deep red as shown by combining cobalt and selenium or other red glasses, for example, 1 Co + 14 Se. An excellent blue glass can be made by…
Color
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