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).
Diagrams showing types of counterweights employed in some cars.
| Identifier | WestWitteringFiles\T\November1928\ Scan130 | |
| Date | 6th November 1928 | |
| FIG. 3. TYPES OF COUNTERWEIGHTS EMPLOYED IN SOME CARS. STR:8 ISOTTA. STR. 8. PACKARD. 18 HP. 6 CYL. DELAGE 40-50HP 6 CYL. DELAGE 6 CYL. DE SOTO. LIMITED PRINT ROOM, 13 NOV 1928 DERBY. Tsm. 6/11/28. | ||