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 two graphs of standard damper performance variation with temperature at high and low pressures.
| Identifier | ExFiles\Box 52\1\ Scan017 | |
| Date | 1st June 1928 guessed | |
| STANDARD DAMPER. VARIATION WITH TEMP. FIG I. LBS/D" PRICES C 15°C 20°C 60°C HIGH PRESSURE. 64/80 LB. LOADS SLOW 13" LEVER 200 CYCLES/MIN. 11" STROKE OF BALL. FIG II LBS/D" LOW PRESSURE. 64/80 LB. LOADS 13" LEVER 200 CYCLES/MIN. 11" STROKE OF BALL. 20°C 60°C MOTORINE C NO APPRECIABLE DIFFERENCE. | ||