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).
Graph comparing Heat Transfer Flow at full load for the 40/50 HP and Hispano models.
| Identifier | ExFiles\Box 22\1\ Scan199 | |
| Date | 22th September 1924 | |
| HT. FLOW FULL LOAD FOR 40/50 HP & HISPANO B.TH.US/MIN. H.P. AT ROAD WHEELS 40/50 H.P. FULL LOAD HISPANO FULL LOAD 22/9/24 A.C.L. [STAMP] REC'D ... [STAMP] 23 SEP. 24 [STAMP] DERBY | ||