producing the Colours of Cloudy Condensation. 



producing Coronal and Axial Colours. 



nuclei from glowing charcoal. 



corrected ^ = '819 ; £=1} min. 



37 cm. in equatorial diam.), corrected y — '916 ; t — ?>\ min. 



27 





Exh. 

 No. 

 ». 



Axial 

 Colour. 



Corres- 

 ponding 

 Corona. 



N'XlO 3 . 



tfxio 8 . 



NxlO 2 . 



v/l/N 



xio 3 . 













cm. 



1/cm. 3 



cm. 





0. 



Nucl 



eation. 



1000 



360 



150 



40 





1. 



Viol-bl. 



Fog. 



889 



370 



130 



42 





2. 



Bl. 



Fog. 



790 



390 



120 







3. 



Bl. 



Fog. 



702 



410 



105 







4. 



Bl-gray. 



Fog. 



624 



420 



94 







5. 



Yl-gr. 



Fog. 



555 



440 



83 



49 





6. 



Gr-yl. 



Fog. 



493 



460 



74 







7. 



Yl. 



Bl-gr. 



438 



470 



66 







. 8. 



Or. 



Do. 



389 



490 



58 



. 





9. 



Or. 



Do. 



346 



510 



52 







10. 



Or-rd. 



Do. 



308 



530 



46 



60 





11. 



Prp. 



Gr-yl. 



273 



550 



41 







12. 



Prp. 



Gr-yl. 



243 



580 



36 







13. 



Viol. 



Yl. 



216 



600 



32 







14. 



Viol-bl. 



Or-rd. 



192 



620 



29 







15. 



Do.* 



Ed. 



171 



650 



26 



73 





16. 



Gr. 



Prp. 



152 



670 



23 







17. 



Yl. 



Do. 



135 



700 



20 







18. 



Yl. 



Viol. 



120 



730 



18 







19. 



Viol? 



Gr. 



106 



760 



16 







20. 



Viol. 



Yl-gr. 



95 



790 



14 



89 





21. 





Or-rd. 



84 



820 



13 



93 





22. 





Viol-prp. 



75 



850 



11 



96 







* Succceeding axial colours extremely faint, 



almost whit 



e; 









surroi 



anding coroi 



las strong. 







prp, purple ; br, brown ; annuli read off from within, outward. 



the field colours toward the yellow. After this the axial 

 colours are already nearly white : the tinge of colour is so 

 faint that it would be hard to recognize it if the sequence of 

 colour were not known from the steam-jet. Nevertheless the 

 march of colour into bluish, greenish, and yellowish tints, 



