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).
Record of piston measurements taken before and after a 6,000-mile endurance test.
| Identifier | ExFiles\Box 86\2\ scan0131 | |
| Date | 25th October 1933 | |
| BENSPORT No 4 TEST IN FRANCE MEASUREMENT OF PISTONS (a) PRIOR TO TEST (b) AFTER 6,000 MILES TEST PISTON E.B. 495 GROUND TO Ex 11480 ROLLS-ROYCE, LTD. PRINT ROOM 25 OCT 1933 DERBY. TABLE DATA: No | Dia' OF PISTON AT. | AA{D. Abbot-Anderson} | BB | CC 1 | a | 3.2457 | 3.2468 | 3.2505 | b | 3.2450 | 3.2470 | 3.2505 | DIFF | -.0007 | +.0002 | - 2 | a | 3.2460 | 3.2480 | 3.2500 | b | 3.2460 | 3.2480 | 3.2500 | DIFF | - | - | - 3 | a | 3.2455 | 3.2478 | 3.2480 | b | 3.2450 | 3.2475 | 3.250 | DIFF | -.0005 | -.0003 | +.0010 4 | a | 3.2455 | 3.2475 | 3.2495 | b | 3.2455 | 3.2470 | 3.2490 | DIFF | - | -.0005 | -.0005 5 | a | 3.2458 | 3.2475 | 3.2480 | b | 3.2455 | 3.2470 | 3.2485 | DIFF | -.0003 | -.0005 | +.0005 6 | a | 3.2460 | 3.2480 | 3.2490 | b | | | | DIFF | BROKEN UP. | ||