From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint showing a top-down view of an aircraft with gun specifications.
| Identifier | ExFiles\Box 176\1\ img040 | |
| Date | 1st March 1940 | |
| 1 - 29.5 m/m GUN. 100 ROUNDS OF AMMUNITION PER GUN RATE OF FIRE 240 ROUNDS PER MINUTE PER GUN MUZZLE VELOCITY 2770 FT/SEC. ROLLS-ROYCE LTD. PRINT ROOM 1 MAR 1940 DERBY. QS.57 | ||