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).
Summary of test results for various types of belts, showing total run time and power transmitted.
| Identifier | ExFiles\Box 135\1\ scan0245 | |
| Date | 8th November 1938 guessed | |
| - 6 - SUMMARY OF TEST RESULTS | Belt | Total Time Run | Average HP Transmitted | Average H.P.hours | | :--- | :--- | :--- | :--- | | Gates Vulco | 11 hrs 45 mins. | 22.6 | 265.55 | | Dayton Cog VC.17 unfinished | 6 " 45 " | 18.65 | 121.825 | | Ferogrip No.1 | 5 " 10 " | 19.7 | 101.77 | | Ferogrip No.2 | 23 " 37 " | 21.45 | 506.57 | | ||