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).
Dimensional analysis of a Napier valve spring with a note on the unavailability of a Mercedes part.
| Identifier | ExFiles\Box 80\3\ scan0145 | |
| Date | 20th August 1912 | |
| R.R. 238 (24 B) (I.L. 512. 20.8.12) F.P. 2350. ROLLS-ROYCE LIMITED. INSTRUCTIONS. To Order No. // Customer's No. Napier Valve Springs [Drawing of a spring with the following dimensions listed from top to bottom]: 1.380" 1.410" 1.550" 1.550" 1.550" 1.550" 1.550" 1.550" 1.550" 1.360" 1.220" 1.140" [Handwritten notes next to the drawing]: Top of Spring. 12 Turns. Right hand Dia. of wire in m/m.{Mr Moon / Mr Moore} Average length of Springs (fully extended) = 3.900". [Handwritten note at the bottom]: The Mercedes bar is not at works, so we are unable to supply desired information. Signed: [Signature] This Sheet must be filed on completion of the work. | ||