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 H.M. Hobson, Ltd. concerning variations in the speed of an air pump.
| Identifier | ExFiles\Box 44\4\ Scan070 | |
| Date | 3rd May 1929 | |
| 113 TYPE TEST X9038 CONTRACTORS TO THE ADMIRALTY, WAR OFFICE, AIR MINISTRY AND TO THE DOMINION & FOREIGN GOVERNMENTS. PLEASE ADDRESS ALL COMMUNICATIONS TO THE FIRM, NOT TO INDIVIDUALS. TELEPHONE: CHISWICK 4231 (4 LINES). TELEGRAMS: "ASSEMBLAGE, LONDON". H.{Arthur M. Hanbury - Head Complaints} M.{Mr Moon / Mr Moore} HOBSON, LTD. (ESTABLISHED 1903) 47-55, ACTON VALE, LONDON, W.3. MANUFACTURERS OF Hobson K-S Petrol Telegage AND MOTOR ACCESSORIES. WORKS: LONDON AND WOLVERHAMPTON. OUR REF. TPS/MW YOUR REF. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/LG. For the attention of W.A.Robotham, Esq., Messrs.Rolls-Royce, Ltd., Expl.Dept. Derby. Dear Sirs, Further to your letter of the 29th ult., with regard to the varying speed at which the piston of the air pump descends, we find that in these first pumps there has been a variation in their speed, and we believe that this variation has been largely due to the manufacture of the pumps themselves in the early stages, i.e. the strength of the springs, friction of leathers etc., We have, however, now established a standard for the speed of the pump when attached to the air line and tank unit, and immersed under a full head of petrol. We find that the time for the descent of the MAJOR SEGRAVE'S "GOLDEN ARROW" was fitted with a NAPIER-LION ENGINE and CLAUDEL-HOBSON CARBURETTERS. | ||