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).
Performance charts for the Gallay 'Hercule' thermostat, showing force, temperature, and extension relationships.
| Identifier | ExFiles\Box 39\4\ Scan316 | |
| Date | 4th May 1933 | |
| GALLAY "HERCULE" THERMOSTAT FORCE REQUIRED TO MAINTAIN PLUNGER AT INITIAL & ALSO .425" FROM INITIAL POSITION IN RELATION TO TEMP TEMPERATURE °C EXPANSION FORCE - LB .425" FROM INITIAL POSITION INCREASING TEMP DECREASING TEMP INITIAL POSITION INCREASING TEMP DECREASING TEMP .825 DIA IBA 4" NATURAL EXTENSION OF PLUNGER IN RELATION TO TEMP TEMPERATURE °C PLUNGER EXTENSION - INS. FORCE REQ'D TO LIFT PLUNGER AT 30° & 40°C CONTRACTION FORCE - LB 30°C EXTENDING 40°C EXTENDING 40°C RELEASING 30°C RELEASING PLUNGER EXTENSION - INS AB | ||