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 an experimental component, detailing its dimensions, convolutions, and performance under compression.
| Identifier | ExFiles\Box 80\3\ scan0078 | |
| Date | 17th November 1911 guessed | |
| (c) Normal length 3 9/32" number of convolutions 9 1/2 end to end of wire, 8 1/2 full section of wire. Compressed to 2" pressure 49 lbs. Compressed to 1 9/16" pressure 70 lbs ( ie 7/16" lift ) Chock a block at 1 5/16" Specially strong, experimental. ? overstressed not yet tested. | ||