Document RjLXyx61qdkVKwndyynDZV0dB

O (N A11SN31NI UOQO ro M -- ---- 2 g.flo s3re C ctE5 eIlOicaE S fo i l 1i i T J: ; 3 . QI 3C m. aa SJ "[ r\ e si 5 gf l P V c f "V j o JL \ ) u >, '* "-\Rl \ Lt \ , 1 L i \% 3 -1 % rE rf<c o-X F 1* \-< i used to determine low concentrations of contaminating gases or vapors in the atmosphere, providing the refractivity of the contaminant is sufficiently different from < Ph \\ \I Xj r \V - r l1 \\ -l IL \ \ i % \ 1 v " J. D. Edwards, V . S. Bur. M ines Tech. Paper No. m (1919). 11F. A. P a tty, J. In d . B yg . Toxicol., 21, 469 (1939). ;w