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).
The procurement and specifications for a H.T. rectifying valve from the Edison Swan Electric Co.
| Identifier | ExFiles\Box 60\2\ Scan075 | |
| Date | 26th February 1931 | |
| X6094 Roy {Sir Henry Royce} /GEA. from EFC. {E. Fowler Clarke - Electrical Engineer} EFC {E. Fowler Clarke - Electrical Engineer} 2/AD26.2.31. X.6094. RECTIFYING VALVE FOR H.T. We have seen the further letter from the Edison Swan Electric Co. ref. WN/WL. of the 25th inst. in connection with their offer to make us H.T. rectifying valves. For immediate purposes we should only require two such valves though probably if their reduction for three warranted it, it would be as well to have a spare. It would be a convenience to us if this valve could be made up in an exactly similar external form to the Osram type U.3. rectifying valve which has already been referred to in correspondence and exact Osram particulars of which are now attached you to send to Messrs. Edison Swan. As the filament end of this valve is fitted with an Edison screw cap that would probably be convenient to them. There is no particular virtue in the plate terminal at the other end being brought out through an ordinary bayonet cap though at the same time there is no particular objection to it. The point is that the one apparatus which we made up, we made to accommodate the Osram U.3. valve and we should like it to accommodate the new valve without change. That being the case we should like Messrs. Edison Swan also to supply us with one screw holder for the filament end of such a valve. If necessary, we could send our present U.3 Osram valve as a model of the external dimensions. We cannot understand why there has not been a demand from other test laboratories etc. for a valve of the type for which we are now asking — it appears to us that if such a valve were marketed and advertised to various test laboratories throughout the country, quite a good number of these could be sold and we suggest that course for Messrs. Edison Swan's consideration. EFC. {E. Fowler Clarke - Electrical Engineer} | ||