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).
Request for two new, more accurate nomograms for calculating engine horsepower to replace inaccurate blueprints.
| Identifier | ExFiles\Box 77\5\ scan0129 | |
| Date | 27th July 1918 | |
| To EFC. from E.{Mr Elliott - Chief Engineer} x 3290 27th July, 1918. E1/G27718. [STAMP] RECEIVED 29 JUL 1918 RE NOMOGRAMS. We have recently had occasion to use the two nomo- grams you sent us, for finding the horse power of an engine given the bore and stroke, and assuming mean effective pres- sure and revolutions. They were exceedingly handy, the results being very quickly obtained, but Mr. Royce was of the opinion that the blue prints were not sufficiently accurate for our purpose, and he would like you to send us two similar nomograms drawn in Indian ink on Whatmans paper, which had previously been suitably mounted on stiff millboard, perhaps with a light wooden frame to prevent "cockling". E.{Mr Elliott - Chief Engineer} | ||