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).
Brake testing, instrument board arrangement, and speedometer drive design.
| Identifier | Morton\M3.3\ img005 | |
| Date | 23th January 1918 guessed | |
| -5- and as we now know better how to test brakes than previous to 1914, the matter should present no difficulty. Instrument Board. Wherever we fit instrument boards they should be arranged, I think, as 49-GB. Speedometer. This is to be driven by raw hide belt sewn with wax end, in such a way as the sewing does not touch the pulley. This is to drive to special fitting design and made by R-R , carrying the other belt pulley and reduction gear into which the flexible shaft is attached from thence to Elliott's speed indicator, specially made for the proper pulley sizes which are to be non-adjustable. The flexible shaft leaving the speed indicator on the inclined dashboard at the best angle of drive. The flexible shaft to run at one-third or one-forth of the engine speed, and the fitting before mentioned to have a non-adjustable pulley about equal in size to that on the propeller shaft. (Sgd) R.{Sir Henry Royce} | ||