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).
Graph comparing the torque vs. angular deflection for Bulged and Standard Hardy fabric couplings.
| Identifier | ExFiles\Box 74\3\ scan0024 | |
| Date | 15th January 1929 guessed | |
| TORQUE LBS FT 800 600 400 200 STANDARD HARDY - - x - - BULGED _____ ANGULAR DEFLECTION DEGREES 1° 2° 3° 4° 5° 6° COMPARISON OF BULGED AND STANDARD FABRIC COUPLINGS | ||