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 showing pressure drop versus water flow for a 'CC' type car heater.
| Identifier | ExFiles\Box 137\1\ scan0215 | |
| Date | 16th December 1936 guessed | |
| 'CC' TYPE CAR HEATER. PRESSURE DROP V.{VIENNA} WATER FLOW FOR HEATER DETAILS SEE CHART L.621/B.1 WATER FLOW. LBS/MIN. PRESS. DROP ACROSS HEATER. INS. OF WATER. | ||