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).
Graph of audibility characteristics for second speed gears, plotting vehicle speed against gear tooth contact frequency.
| Identifier | ExFiles\Box 137\5\ scan0087 | |
| Date | 11th February 1929 | |
| AUDIBILITY CHARACTERISTICS of SECOND SPEED GEARS MILES PER HOUR STD RR BOX EXPL. RR BOX REQ RR BOX GEAR TOOTH CONTACT FREQUENCY - TEETH/SEC. MUSICAL NOTES C D E F G A B c d e f g a b c' d' e' f' g' a' b' SK370 JN 97 RR 11/2/29 EUGENE DIETZGEN CO. CHICAGO-NEW YORK NO. 346-BX | ||