REPLY TO DISCUSSION 1309 



H. Lindgren, C. A. Johnsson, and G. Dyne 



COMPARISON OF THEORY AND EXPERIMENT ON DUCTED 



PROPELLERS 1311 



"Wm. B. Morgan and E. B. Caster, Naval Ship Research and 

 Development Center, Washington, D. C. 



DISCUSSION 1346 



V. Silovic, Hydro- og Aerodynamisk Laboratorium, 

 Lyngby, Denmark 



DISCUSSION 1346 



Gilbert Dyne, The Swedish State Shipbuilding Experi- ■7::s.!i.><:. 

 mental Tank (SSPA), Gothenburg, Sweden 



DISCUSSION 1347 



George Rosen, Hamilton Standard Division of United 

 Aircraft Corp., Windsor Locks, Connecticut 



REPLY TO DISCUSSION 1348 



Wm. B. Morgan and E. B. Caster 



THE BLADELESS PROPELLER 1351 



Joseph V. Foa, Rensselaer Polytechnic Institute, Troy, 

 New York 



ON PROPULSIVE EFFECTS OF A ROTATING MASS 1373 



Prof. Alfio Di Bella, Instituto di Architettura Navale, University 

 of Genoa, Genoa, Italy 



DISCUSSION 1395 



Prof. M. Poreh, Technion-Israel Institute of Technology, 

 Hafia, Israel 



REPLY TO DISCUSSION 1396 



Prof, Alfio Di Bella 



THE AERODYNAMICS OF SAILS 1397 



Jerome H. Milgram, Massachusetts Institute of Technology, 

 Cambridge, Massachusetts 



DISCUSSION 1433 



Hans Thieme, Institut fiir Schiffbau der Universitat 

 Hamburg, Hamburg, Germany 



REPLY TO DISCUSSION 1435 



Jerome H. Milgram 



MAGNETOHYDRODYNAMIC PROPULSION FOR SEA VEHICLES . . . 1437 



E. L. Resler, Jr., Cornell University, Ithaca, New York 



PERFORMANCE OF PARTIALLY SUBMERGED PROPELLERS 1449 



J. B. Hadler and R. Hecker, Naval Ship Research and Develop- 

 ment Center, Washington, D.C. 



DISCUSSION 1493 



H. Volpick, Brown Bros. & Co., Ltd., Edinburgh, 



Scotland 

 DISCUSSION 1494 



S. G. Bindel, Bassin d'Essais des Carenes, -i? 3.7s;<-: 



Paris, France 

 DISCUSSION 1494 



C. Kruppa, Technische Universitat, Berlin, Germany 

 DISCUSSION 1495 



K. Suhrbier, Vosper Ltd., Portsmouth, England 

 REPLY TO DISCUSSION 1496 



J. B. Hadler and R. Hecker 



