Jour. Sc. Coll. Vol. XI. PI. VI. 



Fig. 18. 



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Jan. 28th, 1898. 

 10. 42. 20. a. m. 



Jan, 28th, 1898. 

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Fig. 15. 



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April 16th, 1898. 

 10. 23. 16 a. m 



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Time scale 



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