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 from Colt Ventilation Limited regarding preliminary tests and an attached blueprint for a fan blade apparatus.
| Identifier | ExFiles\Box 135\1\ scan0025 | |
| Date | 22th March 1932 guessed | |
| -2- At any rate we confidently hope that your preliminary tests will prove sufficiently convincing to take the matter further. Yours faithfully, pp COLT VENTILATION LIMITED. P.S. We attach hereto a blueprint showing function of the fan blade apparatus. | ||