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).
Diagram illustrating the angle of a dumbbell component and its interaction with a spherical seating.
| Identifier | ExFiles\Box 92\4\ scan0359 | |
| Date | 21th August 1937 | |
| PH III 21-8-37 ANGLE OF DUMBBELL FOULS HERE ON EXTREME LOCK AND CAUSES A SHEARING ACTION OF THE SPHERICAL END CLOSE UP TO THE NECK. A HOLLOW IS FORMED IN THE SPHERICAL SEATING BY THE DUMB. BELL TO CONFORM. TO ITS REQUIRED WORKING ANGLE. | ||