152 DYNAMIC METEOROLOGY AND HYDROGRAPHY. 

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Fig. 107. Derivative -~- of velocity with respect to the lines of flow. U. S. A., 1905, Nov. 28, 8 a. m. 



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Fig. 108. Divergence 5 of the lines of flow. U. S. A., 1905, Nov. 28, 8 a. m. 



