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 charting the performance and timekeeping accuracy of Smith Electric Clocks over approximately 75 days.
| Identifier | ExFiles\Box 164\1\ img257 | |
| Date | 6th January 1941 guessed | |
| MINUTES +8 +6 +4 +2 0 -2 -4 -6 -8 -10 SMITH ELECTRIC CLOCKS ON 98 SY LONG RUNNING BATT CHARGE BATT LOW CAR STANDING IN SHOP FOR EXAMINATION SMALL MILEAGE. BATT VOLTS NOT ABOVE 12 V.{VIENNA} ANY LONG PERIOD. DAYS 0 10 20 30 40 50 60 70 A.T A.T.4 A.T.1 | ||