No abstract

No abstract

SYNoPsIs-The light filters normally used or recommended for use in England with the mercury vapour lamp photo-electric absorptiometer do not isolate monochromatic light, with the exception of the 577/9 nip. lines. An improved series is described, which give monochromatic light in the more frequently used regions of thc mercury spectrum, and an approxima tion to it in some regions which ha1.e not hitherto been used, i.e., infra-red, red, orange and blue-green.

No abstract

No abstract