Antique Publications

Gerrit

Hi,

I am looking for any of those three very antique publications. I think that, except for the last one, the copyright must be expired by now, I can't find them in any library.

--1-------------------------------------

Frederick W. Lanchester, "A contribution to the theory of propulsion and the screw propeller," Proc. Inst. Auto. Eng., 9, 171., 1915

--2------------------------------------- Albert Betz, "Das Maximum der theoretisch möglichen Ausnützung des Windes durch Windmotoren," 1920.

--3------------------------------------- Karl H. Bergey, "The Lanchester-Betz Limit," Journal of Energy, Vol. 3, No. 6

Thank you in anticipation,

Gerrit Groot