Blueprint showing comparative performance tests between a patented leaf spring and a normal leaf spring.
| Identifier | ExFiles\Box 154\1\ scan0075 | |
| Date | 19th October 1933 guessed | |
| PAT. U.K. 368.313/30. Top middle graph: VIBRATIONS PER MINUTE LOAD - LBS. PATENT SPRING NORMAL SPRING Top right graph: DEFLECTION TESTS LOADING AND UNLOADING LOAD - LBS. NORMAL SPRING PATENT SPRING Bottom left box: IN THESE TESTS THE SPRINGS WERE FORCED DOWN TO FULL LOAD LEVEL AND HELD IN PLACE WITH A PIN. THE SPRING CENTRE WAS LINKED UP WITH A PEN ARM RECORDING ALL MOVEMENT ON A MOVING PAPER STRIP. THE PAPER WAS SET IN MOTION AND THE RETAINING PIN THEN KNOCKED OUT. NORMAL SPRING PATENT SPRING Bottom right box: IN THESE TESTS THE SPRING WAS PLACED UNDER A POWER HAMMER STRIKING 60 BLOWS PER MINUTE, AT A CONSTANT FORCE. THE SPRING CENTRE WAS LINKED UP WITH A PEN ARM, RECORDING THE VIBRATIONS ON A MOVING STRIP OF PAPER. PATENT SPRING NORMAL SPRING | ||
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).