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).
Arrangement drawing for a No. 3 Tachometer.
| Identifier | ExFiles\Box 165\3\ img140 | |
| Date | 8th February 1935 guessed | |
| LARGE END DIA = 19/32, TAPER 1 IN 10 ON RADIUS, 2.64, 7/16 WH., 1/2", 19/32, 5/16, 3/16, 1 1/4", 2", 7", 8 21/32", ARRANGEMENT, OF Nº 3 TACHOMETER | ||