Blueprint showing a cross-section of a piston with an Invar strut, indicating where it tightens in the bore.
| Identifier | ExFiles\Box 15\3\ Scan041 | |
| Date | 24th December 1929 | |
| PISTON TIGHTENS IN BORE WHERE MARKED THUS. INVAR STRUT ROLLS-ROYCE LIMITED FILING ROOM 24 DEC 1929 DERBY 24/12/29 | ||
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).