268 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1962 



Figure 11. — Air-cooled cylinder developed by Dr. A. H. Gibson at the Royal Aircraft 

 Establishment, 1918. This cylinder anticipates the essential features of all modern 

 air-cooled aircraft-engine cylinders, including aluminum head screwed over steel barrel, 

 appHed finning on barrel. From (British) Advisory Committee for Aeronautics report 

 I.C.E. 260. Jan. 1919. 



