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).
Specifications for two alternative springs for dipping headlamps and a parts request.
| Identifier | WestWitteringFiles\K\July1923\ Scan5 | |
| Date | 5th July 1923 | |
| RE GI DIPPING HEAD LAMPS SPRING TO GIVE 10 IN LBS ON LAMP C'SHAFT WIRE .116 DIA 30 TURNS. MEAN RAD. = .410. INITIAL DEFLEXION. 166° --- TORQUE = 10 IN LBS. WORKING DEFLEXION 70°, TOTAL 236° --- TORQUE 14.25 IN LBS. MAX STRESS = 93,000 LBS ☐' LOAD ON HANDLE ABOUT 5.6 LBS. SPRING TO GIVE 5 IN. LBS. ON LAMP C'SHAFT WIRE .092 DIA. 35 TURNS, MEAN RAD. = .400 INITIAL DEFLEXION = 240° --- TORQUE = 5 IN LBS. WORKING DEFLEXION = 70°, TOTAL = 310°. TORQUE = 6.45 IN LBS. MAX. STRESS = 84,400 LBS D' LOAD ON HANDLE ABOUT 2.8 LBS. THESE SPRINGS ARE IN ADDITION TO THE ONE ON N.S. 1427 WHICH IS NOW THOUGHT TO BE TOO POWERFUL. WILL DERBY SEND US A SET OF SPRINGS. WITH SPRING ANCHOR + MODIFIED BRKT, TOGETHER WITH A REAMER FOR THE TAPER PIN. SO THAT WE CAN FIX UP 40H. Ev.{Ivan Evernden - coachwork} 5/7/23. | ||