536 TABLE 557.— LIGHT FILTERS, NARROW SPECTRUM REGIONS 194 



Filters from the following components: Distilled H 2 C» ; Aq. sol. CuSGv5H 2 0; NiSGv 

 7H 2 0- Glasses, Corning G986A, G 586, G980A; dyed gelatin, Wratten niters 88A, 25, 

 61, 49.' 



Solution 



Filter and absorbent 



88A 



88A, H 2 



88A, G986A* 



25, CuSGv5H 2 .... 



61, 



49, 



G586,* " 



G986A, NiSGv7H 2 



164 Tones, L. A., Journ. Opt. Soc. Amer., vol. 16, p. 259, 1928. 

 * Thickness .32 cm. 



TABLE 558.— NARROW BAND PASS FILTERS* 



Thickness Wavelength 



Filter range limits Max 



C.S. 5-74 5. - 7.5 mm .402-.480 M .430^ 



5-76 5.-5.8 .400-.483 .430 



5-75 3.2- 5.7 .395-.495 .460 



4-104 6.-8.5 .467-.530 .485 



4-117 7. -12. .466-.580 .495 



4-105 9.-12.5 .483-.570 .515 



4-102 9. -13.5 .528-.573 .550 



4-115 1 10.-14. .530-.575 .555 



3-110 5.-9. .561-.620 .580 



3-120 6. -10. .565-.670 .590 



2-77 6.5- 9.5 .585-705 .610 



2-78 4.-7. .612-.760 .640 



2-79 8.8-12. .665-.780 .715 



7-84 10.-13. .710-.900 .750 



7-85* 5.-6. .800-1.101 .960 



7-86 7.-8. 1.200-2.800 2.100 



4- 17 5.5-10. 1.700-2.800 2.400 



Transmission 

 at max 



14.5 percent 



27.5 



12.5 



5.3 

 34.0 

 11.0 

 10.6 

 35.5 



3.0 

 19.5 

 11.5 

 16.0 



9.5 

 15.0 

 25.0 

 45.0 

 21.0 



* Corning Glass Works. t Second max at 2.55 with transmission at 5.0 percent, 



at .605 with transmission at 1.0 percent. 



t Second max 



TABLE 559.— TRANSPARENCY OF WATER 165 



Values of a in / = I e' at ; (in cm ; h, I, intensity before and after transmission through dis- 

 tilled water at 20°C; wavelength X in fi. 



185 b, Tsukamoto, K., Rev. d'Optique, vol. 7, p. 89, 1929. c, Dawson, L. H., and Hulburt, E. O., Journ. 

 Opt. Soc. Amer., vol. 24, p. 175, 1934. d, Hulburt, E. O., Journ. Opt. Soc. Amer., vol. 35, p. 698, 1945. 



e, Collins, J. R., Phys. Rev., vol. 26, p. 771, 1925 



SMITHSONIAN PHYSICAL TABLES 



