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The Authors state that using values of C, and C,, which are functions of the KeuleganCarpenter number, to calculate the forces on circular cylinders in waves results in good agreement with experiment except near Keulegan-Carpenter numbers of 1 6 1 5 . However, for some applications it may be necessary to consider C, and CM not as variables but as constants. For instance, Fig. 9 shows the root mean square force F o n a circular cylinder of diameter D in a unidirectional sinusoidal flow generated in a U tube, the

CONCLUSION 4 Four cylindrical web-stiffened sandwich models were tested under external hydrostatic pressure. Experimental strains were recorded on both outside and inside shells and compared with theoretical strains computed from existing formula developed at the David Taylor Model Basin. The differences between experimental and theoretical results were within the range of experimental error. ADMINISTRATIVE INFORMATION This investigation was conducted under the sponsorship of the Bureau of Ships, Code 442, Project No. S-F013 03 02, Task 1956.