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).
Letter to Professor B. Hopkinson inquiring about an optical indicator for aero engines.
| Identifier | ExFiles\Box 79\3\ scan0006 | |
| Date | 26th March 1917 | |
| R.R. 235 a (400 T) (S.C. 536 15-2-16) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1546. 26th March 1917. Prof. B. Hopkinson, Engineering Laboratory, Cambridge University. Dear Sir, Re Indicating Aero Engines. We desire to take accurate indicator diagrams, if possible, from our Aero Engines, and would like to know in this connection whether your Optical Indicator would be suitable for this purpose. We would require the indicator to work up to 350 lbs/sq.inch approximately, at a speed of 1800 revs. per minute of the engine. We would like to hear from you if your Indicator would be suitable for this purpose, and if so, would you kindly put us in the way of obtaining one of these, should we desire. Yours faithfully, 2981 | ||