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 Hopkinsons Limited providing advice on materials for radiator valves, recommending Gun Metal and 'Platnam' metal.
| Identifier | ExFiles\Box 150\3\ scan0124 | |
| Date | 27th January 1937 | |
| S.D. 4772/8753 CODES: BENTLEY'S A.B.C. 5TH. EDITION. LIEBERS. WESTERN UNION. 1280 HOPKINSONS LIMITED. D {John DeLooze - Company Secretary} /RCA/AR/MNEDup/PATENTEES & MANUFACTURERS OF SAFETY BOILER MOUNTINGS & VALVES. HUDDERSFIELD. LONDON 34 NORFOLK STREET, STRAND, W.C.2. TELEGRAMS: VALVESTEM. PHONE. LONDON. TELEPHONE: TEMPLE BAR 4541 (3 LINES) TELEGRAMS: HOPKINSON HUDDERSFIELD. TELEPHONE: HUDDERSFIELD 3469 (5 LINES) DIRECTORS: R.A. HOPKINSON (Chairman) E.W. CRAMMOND (Deputy Chairman) R.L. BROWN (Managing Director) R.H. DALTON C.J. HOPTON P.G. HOPKINSON F.B. MILLS R.S. TURNBULL STEADMAN Rolls-Royce Ltd., DERBY. WmRm/STD Wednesday, January 27th 1937 IN REPLY PLEASE QUOTE T.4. 'RCA' IN REPLY TO YOUR Rm {William Robotham - Chief Engineer} /Std.29/JH. SUBJECT VALVES FOR RADIATORS - 10 LBS PER SQ.IN. CORRESPONDENTS WOULD OBLIGE BY WRITING SEPARATE LETTERS ON SEPARATE SUBJECTS. When Rm {William Robotham - Chief Engineer} /STD Dear Sirs, We thank you for your letter of the 8th January, and must apologize for the delay in our reply, owing to the unfortunate disorganisations which have recently occurred through the illness of many members of our Staff. We trust you have been put to no inconvenience, and give you our advice as follows. For the valve body we would recommend our standard Gun Metal, which we supply for steam pressures up to 250 lbs per sq.inch, temperatures up to 500oF. In view of the very low working pressure of 10 lbs per sq.inch which you are contemplating, you will see that these Valves will have a generous margin of strength, and complete immunity to distortion. The Valve and Seat would be in our 'Platnam' metal which is an extremely hard non-corrodible material, with exceptional lasting qualities, and obtains its natural hardness without heat treatment or any other process. | ||