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).
Chart and graph detailing the operating characteristics of different thermostat-operated shutters.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan142 | |
| Date | 22th October 1930 guessed | |
| THERMOSTAT OPERATED SHUTTERS PII TABLE: TYPE OF THERMOSTAT | MEAN RUNNING TEMP. | STARTS TO OPEN | STARTS TO CLOSE | FULL OPEN | FULL CLOSED STANDARD | 55* | 56° | 58° | 61° | 48° SPECIAL A | 62* | 61° | 63° | | 55° SPECIAL B | 73°C | 73° | 75° | | 67° * ESTIMATED FIGURE: A.B. TEMP NOT LOW ENOUGH TO RECORD ACTUAL TEMP. GRAPH: Y-AXIS: LBS. LOAD FROM THERMOSTAT (Scale from 40 PULL to 100 PUSH) X-AXIS: TOP WATER TEMP. C° (Scale from 20 to 100) GRAPH LABELS: LOAD TO OPEN SHUTTERS 10 LBS. LOAD TO CLOSE SHUTTERS 5LBS. LOADS MEASURED ·250" FROM BOTTOM OF STROKE CURVE LABELS: STANDARD, A, B | ||