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).
Information required for ordering a Bonniksen Dead Beat Speedometer.
| Identifier | ExFiles\Box 39\2\ Scan242 | |
| Date | 3rd September 1919 | |
| Ck.{Mr Clark} from BY.{R.W. Bailey - Chief Engineer} BY25/P3.9.19. X.3508 RE BONNIKSEN DEAD BEAT SPEEDOMETER. Referring to the information necessary to order the above, will you please note that the following information should be given:- (1) Revs of Propeller shaft per mile cover 1940. (2) Diameter of Pulley carried by Propeller shaft 4.300" (3) We shall require 7 feet of flex between the driving pulley and the Instrument Board. (4) The Instrument should be suitable for screwing up to the back of the Instrument Board. (5) If the direction of rotation is important this is counter clockwise looking along the flex towards the Instrument. (6) The width of type of <strike>pulley</strike> belt - .750 raw hide flat belt. By BY.{R.W. Bailey - Chief Engineer} | ||