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).
Test results for Smith's Calorstat, measuring load required to maintain bellows in open and closed positions.
| Identifier | ExFiles\Box 39\4\ Scan187 | |
| Date | 23th October 1930 | |
| X3499. 23.10.30. X3499. SMITH'S CALORSTAT TESTS. LOAD REQUIRED TO MAINTAIN BELLOWS IN "SHUTTERS CLOSED" POSITION. TEMP. | CALORSTAT "A". | CALORSTAT "B". °C. | PULL.LB | PUSH.LB | PULL.LB | PUSH.LB _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 20 | 31.2 | | 34.6 | 30 | 24 | | 31.5 | 40 | 13.5 | | 27 | 50 | 5.7 | | 24 | 60 | | 7.5 | 16.35 | 70 | | 19.5 | 5.7 | 80 | | 37.5 | | 7.5 90 | | 72.5 | | 25.5 95 | | 90.5 | | 37.5 LOAD REQUIRED TO MAINTAIN BELLOWS IN "SHUTTER OPEN" POSITION. TEMP. | CALORSTAT "A". | CALORSTAT "B". °C. | PULL.LB | PUSH.LB | PULL.LB | PUSH.LB _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 20 | 40.7 | | 46.7 | 30 | 36.1 | | 42.2 | 40 | 33.1 | | 39.1 | 50 | 24 | | 34.6 | 60 | 11.2 | | 27 | 70 | | 5.5 | 19.4 | 80 | | 27.5 | 7.2 | 90 | | 52.5 | | 10.5 95 | | 76.5 | | 16.5 CALORSTATS WITH SPECIAL FILLINGS. | ||