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. recommending the use of Crookes 'A' glass in instruments to prevent the fading of liquid.
| Identifier | ExFiles\Box 61\3\ scan0204 | |
| Date | 25th June 1931 | |
| X4038 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. H.M. HOBSON, LTD. (ESTABLISHED 1903) 47-55, THE VALE, ACTON, LONDON, W. 3. MANUFACTURERS OF Hobson Motor Accessories. Claudel-Hobson Carburetters. Hobson-Perfect Window Regulators. Hobson K-S Petrol Telegages. Hobson Sparking Plugs. WORKS:- LONDON AND WOLVERHAMPTON. ENCLO. OUR REF. TPS/MW YOUR REF. 25th June 1931. Messrs. Rolls-Royce, Ltd., Derby. For the attention of W.A. Robotham, Esq., Dear Sirs, We have now got some further information with regard to the fading of the liquid, which we would like to transmit to you, in connection with the cases which you have reported to us recently. First of all we are now of the definite opinion that it will be advantageous to adopt Crookes "A" glass for your instruments in future, as from investigations carried out at a research association in this country, and confirmed by American experience, this will have a beneficial effect on the period over which the liquid will retain its original colour. Therefore if you can see your way to sanction this modification, we will incorporate it at the earliest date in any gauges which | ||