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).
Test report No.2 detailing measurements of torque, temperature, and wear over time at specific jaw loads.
| Identifier | ExFiles\Box 145\1\ scan0231 | |
| Date | 11th September 1937 guessed | |
| No.2. Time Jaw Load Torque Temp. Wear Minutes Lbs. Lb. Ins. °F.{Mr Friese} Notches 0 500 7 280 3 (Run in) 500 6 277 0 1500 19 267 5 " 18 269 10 " 16 258 10 15 " 15 268 10 20 " 16 266 20 25 " 18 267 20 30 " 18 267 20 35 " 20 280 20 40 " 20 269 20 45 " 20 269 36 50 " 17 283 46 55 " 17 265 46 60 " 17 264 46 TEST PIECES. Similar to No.1. | ||