520 O. Grim 
(0) 0.5 1.0 1.5 
OSCILLATOR FREQUENCY (CPS) 
Fig. Dl. The calculated and measured amplitude of 
total pressure fluctuation 
NORMALIZED VERTICAL FORCE 
0 0.5 1.0 1.5 
OSCILLATOR FREQUENCY (CPS) 
Fig. D2. The calculated and measured 
total vertical force 
O. Grim 
Prof. Wehausen’s report about the work carried out at the University of California by 
W. R. Porter must be welcomed. I have seen this work only recently and did not know about 
it before the symposium. Indeed this work represents a helpful contribution to the problems 
dealt with in my paper. It is important that the mentioned experiments will be continued be- 
cause only a few experimental results with respect to the forces on oscillating two-dimen- 
sional bodies are known. Such experimental results, however, are needed. Tasai, too, has 
carried out such experimental work. Since no severe differences seem to exist between the 
known theoretical and experimental results for the two-dimensional cases, we can be 
