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).
Compression and recoil graph for various spring and oil spring combinations under different conditions.
| Identifier | ExFiles\Box 46\1\ Scan130 | |
| Date | 3rd June 1919 guessed | |
| Compression of Spring in inches. Flexibility of Spring in lbs pr inch. O.a.a.O. Compression and recoil Graph of Spring 200lbs pr in. flex. 4" of def. O.b.b.O. 300lbs " " " " " Graph X. O'C.C.O Graph of 200lb Spring 2" def. combined with that of Oil Spring period 130 p.m. " Y. O'a.n.O " " " " " 4" " " " " " " " " Z. O'a.a.O. " " " " " 4" " " when under forced vibration or sudden shock. The Retrac Co. 52 Vanderbilt Ave. N.Y. City. [Handwritten at top] 21a [Printed vertically on right edge] KEUFFEL & ESSER CO., NEW YORK, NO. 359 G | ||