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).
Specification sheet for experimental belts, detailing their required dimensions.
| Identifier | ExFiles\Box 135\1\ scan0084 | |
| Date | 10th November 1937 | |
| Rm{William Robotham - Chief Engineer}/Std.3/MH.{M. Huckerby}10.11.37. PARTICULARS OF EXPERIMENTAL BELTS REQUIRED FOR R.R. LTD. Angle of Belt V section (with belt straight) 30° Width of Belt section at ( " " " ) 15/16" top of V.{VIENNA} Depth of Belt V section ( " " " ) 9/16" Outside circumference 42.640" Inside - " 39.110" Diameter of inside edge of belt with belt - 12.450" circular | ||