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 springs for a Continental PH.III radiator steam valve and an alternative steam valve.
| Identifier | ExFiles\Box 92\6\ scan0197 | |
| Date | 19th August 1937 | |
| Rm{William Robotham - Chief Engineer}/Std.12/AP.19.8.37 PARTICULARS OF SPRING FOR CONTINENTAL PH.III. RADIATOR STEAM VALVE (6 lbs/sq.in.) Wire dia. - .104 (12.SWG.) Mean dia. of coils - 1.304" No. of coils (total) 4. " " " (working) 2 Free length. - .770 Load when compressed to .580 to be 7.25 lbs. Material- S/CV. To be copper deposited finally. ------ PARTICULARS OF SPRING FOR ALTERNATIVE STEAM VALVE 6 lbs/sq.in. Wire dia. - .022 - 24 SWG. Mean dia. of coils - .353 No. of coils (total) - 17. " " " (working) -15. Free length - 1.405 Load at .590 to be 7.4 ozs. Material S/CV. To be copper deposited. ------ | ||