USAAF bomb dropping angle scales
'Preset Dropping Angle Scales, Combat Bombs For ; Dead Reckoning Computers'. By G Felsenthal & Sons, Chicago. Set of three plastic sheets, each approximately 27.5cm x 10cm and marked with information relating to the release of bombs from different altitudes. Covers 100lb to 200lb bombs at heights from 500 to 900'; 100lb to 2000lb bombs from 500' to 900'; 100lb to 300lb bombs at heights from 900' to 1300' & 1000' to 3000' and 500lb to 2000lb bombs at heights of 900' to 1300' and 1000' to 3000'. These are contained in the original olive drab pouch that is well marked with contract and part numbers, manufacturer's details and Army Air Force stamp. Minor marks on the scales, otherwise in excellent condition. Stock code M22291.