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).
Comparing the weights of L-E engines versus standard engines.
| Identifier | ExFiles\Box 19\7\ Scan026 | |
| Date | 1st October 1913 | |
| X790 Comparison L-E Engines 63 & 64 lbs Standard a.{Mr Adams} 58 & 59 lbs average. For Harkness v.{VIENNA} 1:10:13. | ||