Letter from H.M. Hobson Ltd. regarding a sample skeleton top for a single-line Telegage unit and test findings.
| Identifier | ExFiles\Box 61\3\ scan0216 | |
| Date | 15th July 1931 | |
| CONTRACTORS TO THE ADMIRALTY, WAR OFFICE, AIR MINISTRY AND TO THE DOMINION & FOREIGN GOVERNMENTS. TELEPHONE: SHEPHERDS BUSH 3321. (4 LINES) TELEGRAMS: "ASSEMBLAGE, LONDON." PLEASE ADDRESS ALL COMMUNICATIONS TO THE FIRM, NOT TO INDIVIDUALS. MANUFACTURERS OF Hobson Motor Accessories. Claudel-Hobson Carburetters. Hobson-Perfect Window Regulators. Hobson K-S Petrol Telegages. Hobson Sparking Plugs. WORKS:- LONDON AND WOLVERHAMPTON. H.M. HOBSON, LTD. (ESTABLISHED 1903) 47-55, THE VALE, ACTON, LONDON, W. 3. OUR REF. TPS/MW YOUR REF. 15th July 1931. Messrs. Rolls-Royce, Ltd., Expl. Dept. Derby. For the attention of W. A. {Mr Adams} Robotham, Esq., Dear Sirs, We have forwarded to you under separate cover, by parcel post, addressed for your attention, one skeleton top as designed for the single line Telegage unit, a sample of which the writer left with you recently. During our tests of this unit for air venting, and also for the discharge of petrol on over-filling, it was found necessary to maintain a cross-sectional area of at least 9/16" both through the union, and for the inside bore of the overboard vent pipe, to prevent an excess rise in the gauge in the case of over-filling and unusual pressures. It was also found highly beneficial to project the bell vent pipe into the union passage, which apparently considerably increases its effectiveness as a bell vent, and also enables | ||
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).