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).
Performance graph for '720 Worm Motorine C' plotting force against load on the nut.
| Identifier | ExFiles\Box 67\4\ scan0380 | |
| Date | 23th September 1927 | |
| FIG. IV '720 WORM MOTORINE C. OIL SUPPLIED TO WORM AT PRESSURE OF 25 LBS/D". 23/9/27. NO STICKING AT ALL Vertical Axis: FORCE AT 20" RADIUS. LBS Horizontal Axis: LOAD ON NUT. LBS. Data series annotations: µ = .1019, 55.6% a µ = .0527, 89.4% b, 100% EFF. µ = .0076, 91.7% c µ = .0996, 19.2% d | ||