Chart showing sparking plug temperatures for an Eagle II aero engine across twelve cylinders.
| Identifier | ExFiles\Box 11\3\ 03-page543 | |
| Date | 2nd January 1928 | |
| H.T.29/2.1.28 EAGLE(Aero Engine) II AERO ENGINE SPARKING PLUG TEMP. HOT SIDE CYL No. 1A CYL No. 2A CYL No. 3A CYL No. 4A CYL No. 5A CYL No. 6A CYL No. 1B CYL No. 2B CYL No. 3B CYL No. 4B CYL No. 5B CYL No. 6B 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400 | ||
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).