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 types of counterweights employed in some cars.
| Identifier | ExFiles\Box 25\3\ Scan373 | |
| Date | 6th November 1928 | |
| FIG. 3, TYPES OF COUNTERWEIGHTS EMPLOYED IN SOME CARS., STR. 8 ISOTTA., STR. 8. PACKARD., 18 H.P. 6 CYL. DELAGE, 40-50 H.P. 6 CYL. DELAGE, 6 CYL. DE SOTO., RECEIVED, 13 NOV 1928, DERBY, Tsm. 6/11/28. | ||