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 G. Cussons, Ltd. discussing the Dalby-Watson Optical Indicator and arranging a visit to see it in operation.
| Identifier | ExFiles\Box 79\3\ scan0046 | |
| Date | 14th September 1917 | |
| X.3181. EFC1/T14917. 14th Sept. 1917. Messrs. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Cussons, Ltd., The Technical Works, Lower Broughton, Manchester. Dear Sirs, Re Dalby-Watson Optical Indicator. We thank you for your letter of the 12th. inst., containing two Indicator Diagrams taken with the above indicator at 2300 r.p.m. These are very interesting to us, and we would like to have known the scale of these diagrams, as the suction loops look proportionally large, unless the maximum pressure is only moderate. We note that the indicator will work up to about 400 lbs/sq.inch and to a speed of about 2300 R.P.M. This of course would quite cover our requirements for any one of our three types of engines. We think it would be worth our while to come and see this indicator in operation, and if you could arrange for this on Thursday or Friday next, the writer will be very pleased to pay you a visit for this purpose. Yours faithfully, | ||