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).
Specification note for a standard piston, detailing its features, part number and weight.
| Identifier | ExFiles\Box 3\3\ 03-page020 | |
| Date | 21th July 1911 | |
| R.R. 10-20 H.P. (15A11)-3-10G. X200 3Y00. Engines. Piston E1319. Standard, cross webs. 3 double rings. concave tops, with strengthening pieces to cross webs. Piston weight 4lbs 6oz. Gudgeon pin locking nut 8d. 20/1/11 Standard - 3 bosses inside for piston (on single rings instead of as yet adopted) EP{G. Eric Platford - Chief Quality Engineer} 21/7/11 | ||