26 Prof. C. Bums on the Sizes of the Water Particles 



Diameters and Numbers of Water Particles 



N / =N rt '10 w < 1 +^ 10 ^; b = 'l; 



For coronus (globe, 30 cm. in diam.), 



For axial colours (doubly conical drum, 187 cm. long, 



Exh. 



No. 



Corona. 



N'xlO 3 . 



tfxlO 6 . 



Nx 10*. 



v'i/N 





n. 











XlO 3 . 











cm. 



l/cm. 3 



cm. 





0. 



Nucleation. 



1000 



260 



830 



23 





1. 



Fog. 



791 



280 



660 



25 





2. 



Fog. 



626 , 



310 



520 







3. 



Fog. 



495 



330 



410 







4. 



Yellowish, Eeddish. 



392 



360 



320 







5. 



Do., smaller. 



310 



390 



260 



34 





6. 



Wh-yl, prp, gr-yl. 



245 



420 



200 







7. 



Bluish, gr-bl, or, rd. 



194 



450 



160 







8. 



Greenish, gr, prp, gr. 



154 



490 



130 







9. 



Gr-yl, prp, gr, rd. 



122 



530 



100 







10. 



Yl, or-rd, gr, prp. 



96 



570 



80 



50 





11. 



Yl, or, rd, gr, viol, gr. 



76 



620 



63 







12. 



Wh-viol, prp, bl, gr, rd. 



60 



670 



50 







. 13. 



Wh, prp, gr, rd, gr. 



48 



730 



39 







14. 



Gr, bl-gr, rd, gr. 



38 



780 



31 







15. 



Gr-yl, br, gr, rd. 



30 



850 



25 



74 





16. 



Yl-wh, or-rd, gr, viol. 



24 



920 



20 







17. 



Wh, prp, gr. 



19 



990 



15 







18. 



Wh, gr-yl, bl-gr, rd, gr. 



15 



1070 



12 







19. 



Wh, rd-br, gr, bl, rd. 



12 



1160 



10 







20. 



Wh, rd, gr. 



92 



1250 



7-7 



111 





21. 



Wh, br, bl, gr, rd, gr. 



7-3 



1350 



60 







22. 



Do. 



5-8 



1460 



4-8 







23. 



Do. 



4-6 



1580 



38 







24. 



Do. 



36 



1710 



30 







25. 



Do. 



29 



1850 



24 



161 





26. 



Do. (faint). 



23 



2000 



19 







27. 



Do. 



1-8 



2160 



1-5 







28. 



Do. (very faint). 



1-4 



2340 



1-2 







29. 



Vanishing. 



1-1 



2530 



•9 







30. 



Do. 



•9 



— 





— — 





Note : — Wh, whits ; yl, yellow ; or, orange ; rd, red ; gr, green ; bl, blue ; 



drum. In the globe it appeurs as a diffuse, tawny, red- 

 rimmed fog. The first pronounced contrast appears in the 

 orange-red axial colour and the blue-green or green-blue 

 field. This is usually definite and complimentary in cha- 

 racter. The axial colours then move toward the violet and 



