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).
Corrected mask scale diagram for No Sump Tanks 40/50, comparing telegauge readings to actual liquid levels.
| Identifier | ExFiles\Box 44\2\ Scan103 | |
| Date | 15th February 1928 guessed | |
| CORRECTED MASK SCALE FOR NO SUMP TANKS 40/50 TELEGAUGE SCALE 20 16 12 8 4 0 ACTUAL LIQUID LEVEL 20 16 12 8 4 0 CORRECTED GRADUATION FOR NO SUMP TANKS | ||