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).
Graph charting the output of Clayton S.2 type car heaters against motor volts.
| Identifier | ExFiles\Box 137\1\ scan0218 | |
| Date | 16th December 1936 | |
| OUTPUT OF CLAYTON S.2 TYPE CAR HEATERS CHARTED AGAINST MOTOR VOLTS CONSTANT WATER FLOW 2 GALLS/MIN AIR INLET 60°F WATER MEAN 180°F TUBE TYPE 23/1/4/24/106/37 S2A/06/15 4 BLADE FAN 4 5/8" DIAM., 30° ANGLE MOTORS - S.2.CA - KLAXON E.C.M. 12 VOLT & 6 VOLT S.2.RA - KLAXON D.L.M. "SILENT" 12 VOLT MOTOR WATTAGE INPUT VOLTS ACROSS MOTOR B.T.U.S / HR. / 120°F TEMP. DIFF. AIR INLET TO WATER MEAN WATTS = S2CA (6V) S.2 CA (6 VOLT) B.T.U.S WATTS = S.2CA (12V) S.2 CA (12 VOLT) S.2.RA (12 VOLT) WATTS = S.2RA (12V) RH{R. Hollingworth} 16/12/36 | ||