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).
Instructions on the design and fitting of radiators, thermostats, thermometers, pressure feed pumps, and speedometers.
| Identifier | ExFiles\Box 181\M11\ img175 | |
| Date | 1st May 1919 | |
| (1) RADIATORS (CONTD.) -2- preferably operated from the dash, and should also be made if possible, so as to be adapted afterwards for operation by a thermostat. The thermostat when fitted in a convenient position for operating the louvres might require its water connections to be made in a manner which would short-circuit the radiator; this would be of no consequence. For designs still further ahead it is proposed to carry the thermostat actually in the top tank of the radiator. (2) THERMOMETER.- Mr. Royce instructs that a thermometer must be fitted on production cars until a thermostat is standardised for operating the radiator louvres. Sample thermometers now being tested, supplied by the Cambridge Scientific Instrument Co. should be examined to see if they work by vapour pressure or the expansion of liquid. This thermometer must be fitted flush with the instrument board. x.3454. x.3538✓ (3) PRESSURE FEED PUMP.- For the first cars to be made the pressure feed pump should be similar to that fitted to chassis 7 CA. which is the old well-tested model, but with the capacity altered by the addition of a suitable plug in the head so that the pumping pressure is put up to 3 lbs. These pumps should be fitted until the new pump is available, which has been already instructed from West WitteringHenry Royce's home town. x.1809.✓ (4) SPEEDOMETER AND SPEEDOMETER DRIVE.- The sample brought to West WitteringHenry Royce's home town of the Elliott speedometer, is very bulky and heavy. Since, however, Elliotts appear to be the only British instruments available and suitable, Mr. Royce instructs that we stick to their productions, but tell them that we do not want such an elaborate instrument as the trip-model, but the type fitted to 49 GB. is sufficient. (Contd.) | ||