518 O. Grim 
R the total nondimensional force which is necessary to produce the heaving mo- 
tion in the two-dimensional case 
E nondimensional force excited by the wave in the two-dimensional case 
C coefficient of the virtual mass 
A ratio of amplitudes 
REFERENCES 
[1] Havelock, T.H., Trans. Inst. Naval Architects 86 (1945) 
[2] Havelock, T.H., Trans. Inst. Naval Architects 97 (1956) 
[3] Havelock, T.H., Trans. Inst. Naval Architects 99 (1958) 
[4] Hanaoku, T.S., “Proceedings of the Symposium en the Behaviour of Ships in a Seaway,” 
Wageningen, 1957 
[5] Eggers, K., Ingenieur Archiv, 1960 
[6] Korvin-Kroukovsky, B.V., and Jacobs, W.R., Soc. Nav. Arch. Marine Engrs., 1957 
[7] Tasai, F., J. of Zosen Kiokai, July 1959 
[8] Kreitner, H., Trans. Inst. Naval Architects 80 (1939) 
[9] Abels, F., Jahrbuch der Schiffbautechnischen Gesellschaft 1959 
[10] Grim, O., Jahrbuch der Schiffbautechnischen Gesellschaft 1953 
[11] Grim, 0., “Proceedings of the Symposium on the Behaviour of Ships in a Seaway,” 
Wageningen, 1957 
[12] Grim, O0., Forschungshefte fur Schiffstechnik 1957, S. 99 
DISCUSSION 
John V. Wehausen (University of California) 
The following remarks are supplementary to that part of Dr. Grim’s paper which deals 
with the heaving motion of two-dimensional bodies. However, they are also supplementary - 
in an important sense to the whole paper, for they deal with the applicability of theory to 
experiment. The work described below was carried out by W. R. Porter as part of a doctoral 
dissertation at the University of California, Berkeley. 
