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).
The accuracy and reliability of various types of car clocks.
| Identifier | ExFiles\Box 164\1\ img255 | |
| Date | 6th January 1941 | |
| - 2 - Cont'd.{John DeLooze - Company Secretary} Rm{William Robotham - Chief Engineer}/RC.{R. Childs}247.6.1.41. 8.B.V. . . . . . .+5 mins. per week. 9.B.V. . . . . . .+2 1/2 " " " 10.B.V. . . . . . +2 1/2 " " " 12.B.V. . . . . . .+4 1/2 mins. per week. 4.B.30. . . . . .+3 1/2 " " 1-R-1 . . . . . .5 " " " We feel that 2 minutes per week, all on the plus side, is a reasonable figure to aim at, and see no reason why the Makers should not get down to this. At the moment, we are of the opinion that the motor type clock will prove more reliable than the "Empire" electrically wound clock, but not so accurate since the former is dependant on running conditions. However, if the Makers can get down to the 2-minute a week limit, which they have not done yet, since only 30% are within three minutes, we favour the lighter and simpler motor type. The only alternative is a good hand wound clock. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||