Smithsonian Report, 1962. — Taylor 



PLATE 23 



J\\ x^ 



1. Side i>|ie Uii iKi-Mijicicliaruci installation on Curtiss L)-12 engine, 460 hp., in Curtiss 

 Falcon airplane, 1931. (Courtesy Materiel Div., U.S. Air Force.) 



2. N.A.C.A. Roots type supercharger, coupled to Pratt ix Whitnc}' "Wasp" engine in a 

 W right Aero. Corp. "Apache" airplane. This installation broke the world altitude record 

 in 1927. This was the only successful displacement-type supercharger. A, Supercharger; 

 B, air intake; C, delivery pipe through intercooler D; E, supercharger bypass. 



