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).
Value and potential issues of a 'Vacuphon' horn.
| Identifier | ExFiles\Box 59\3\ Scan017 | |
| Date | 29th May 1914 | |
| SS.{S. Smith} 150a (150 H) (W. W. 276. 12-5-14) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 6547. C O P Y. V1569 X1310 Re "Vacuphon" Horn. Wor.{Arthur Wormald - General Works Manager} Na{Mr Nadin}7/IB29514. 29/5/14. MCE. for Hy.{Tom Haldenby - Plant Engineer} I should be glad if you would kindly read the attached circular, and say whether you consider it might be of any value. It seems to possess a-n advantage over the Gabriel Horn, inasmuch as it is most effective when the engine is throttled. At that time the vacuum in the induction pipe is highest. I am afraid, however, it would interfere with the slow running of the engine. (Sd) T.N. Attach. Original & circular sent to Hy.{Tom Haldenby - Plant Engineer} 29/5/14 | ||