Chief Supt., Naval Res Establishment 

 c/o Fleet Mail Office, Halifax, 

 Nova Scotia, Canada 



Dr. J. Ackefet, Institut fur Aerodynamik der 

 Eidgenossiche, Technische Hochschule, 

 Zurich, Switzerland 



Prof. G.K. Batcfieior. Trinity College, 

 Cambridge Univ, Cambridge, England 



Prof. L. Escande, Ingenieur, Oitecteur Ecole 

 Nationale Superieure d'Electrotechnique et 

 d'Hydraulique, 4, Boulevard ^louet, 

 Toulouse, France 



Prof. L. Howarth, Dept of Math. Univ of Bristol, 

 Bristol, England 



Prof. Harold Jeffreys, St. John's College, 

 Cambridge, England 



Ir. J. Gerritsma, Delft Shipbldg Lab, 

 Prof, Mekelweg, Delft, The Netherlands 



Supt, Aero Div, Natl Physical Lab, Teddington, 

 Middlesex, England 



D)R, Royal Aircraft Establishment Aero Dept, 



Farnborough, Hants, England 



DIR, Aero Res Inst of Sweden, 

 Ranhammarsvagen 12; Ulsvunda, Sweden 



The Univ of Liverpool, Math Inst, Dept of 

 AppI Math, Grace Library, Liverpool, England 



Editor, Bulletin of the British Hydro Res Assoc, 

 Netteswell Road, Harlow, Essex, England 



Dr. Siegfried Schuster, Head, Berlin Model Basin 

 Versuchsanstalt fur Wassertiau und Schiffbau, 

 Schleuseninsel im Tiergarten, Berlin 87, Germa 



Dr. H.W. Lerbs, DIR, Hamburg Model Basin, 

 Hamburgische Schiffbau-Versuchsanstalt, 

 Bramfelder Str. 164, Hamburg 33, Germany 



35 



