P/b, 20x28cms. 84p. April 1942. Published by the Supercharger Service School. Marked as 'Restricted'. Lectures deal with the functions of aircraft engine superchargers; performance of a turbosupercharger in the B-17B; installation of superchargers; operating characteristics of turbo-supercharged airplane power plants etc. Some illustrations, charts etc. The leather-look card cover is creased/dog-eared and the pages are yellowed. Stock code P14411.