"Tides and Current Velocities in a Sea-Level Canal," J. Lamoen, Engineering, 

 Vol. 168, No. 4357, July 29, 1949. 



The author presents a mathematical approach, based on Holster's "Lines- 

 of-Influence" method, to the predetermination of the tidal regime in 

 the new proposed sea-level Panama Canal, His investigation is based 

 on data bv Meyers and Schultz, who treated the problem by means of 

 a small-scale model. As far as could be ascertained, the agreement 

 between experimental results and the authors study may be regarded 

 as a fair one. In conclusion the author states that any important 

 technical problem' involving tidal phenomena should be submitted to 

 both experimental and analytical treatment, and when the results of 

 the two lines of approach agree, they may be regarded as reasonably 

 accurate, 



"Results and Problems of Heavy Mineral Analysis in Germany: A Review 

 of Sedim.entary-petrolofp.cal Papers, 1936-194.8," F. K. Heinz Sindowski, 

 Edited by L. Dryden, Journal of Sedimentary Petrology, Vol. 19, No. 1, 

 April I049. 



This paper is a review and discussion of research in sedimentary 

 petrology in Germany during the years 1936-48 with particular 

 emphasis to heavy mineral analysis , The author presents the 

 methods of analysis, selection of .rrain sizes for analysis, and 

 several examples of studies of the heavy mineral assemblages found 

 in various geological horizons, Further investigation on heavy 

 mineral resistance to transportation and the meaning of grain shape 

 is necessary before our present knowledge of these problems can be 

 considered satisfactory. 



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