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 Autovac Manufacturing Co. Ltd. concerning the supply of Autovacs and associated fittings.
| Identifier | ExFiles\Box 40\4\ Scan030 | |
| Date | 12th July 1921 | |
| Telegrams: "AUTOVAKING, STOCKPORT" Telephone No. 5080 THE Autovac Manufacturing Co. Ltd. HEATON NORRIS, STOCKPORT Directors: J.{Mr Johnson W.M.} HIGGINSON H.{Arthur M. Hanbury - Head Complaints} ARUNDEL J.{Mr Johnson W.M.} A.{Mr Adams} CHARLTON G.{Mr Griffiths - Chief Accountant / Mr Gnapp} A.{Mr Adams} GASTALL Patentees & Makers of the Autovac Petrol Feed System Patents No. 12835-11, 20191-14, 11992-15, 16396-15, & 104256-16 All Communications to be addressed to the Company July 12th, 1921. Your Ref. Our Ref. SR/BC: Messrs. Rolls Royce Limited, Osmaston Road, DERBY. Dear Sirs, For attention of Mr. Bailey, Goshawk 2. As requested by our Mr. Gastall we are sending under separate cover one each of our Standard Autovacs with labels attached showing the types and reserve of petrol which each contains when working, also two induction pipe fittings. Incorporated with the suction elbow is the Non Return Valve which in addition to preventing back-firing reaching the Autovac greatly increases the volumetric efficiency of the vacuum in the induction pipe. We have found from experiments that if we fit the Non Return Valve close to the induction pipe the lifting power of the vacuum is increased by one foot. The 2nd fitting for the induction pipe is the venturi tube which can either be left open to the atmosphere or coupled to the exhaust pipe. Enclosed you will find results of test taken on 15 h.p. engine running on 900 Revs., developing 16 h.p. its full load. Depression in the induction pipe was ½" vacuum. Trusting same will interest you. We remain, Yours truly, For AUTOVAC MNFG., COMPANY LTD., Hoyle Manager. | ||