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).
Comparing output figures for voltage regulators from a supplier and internal drawings, highlighting discrepancies and requesting further testing.
| Identifier | ExFiles\Box 166\2\ img216 | |
| Date | 6th September 1938 | |
| To Rm{William Robotham - Chief Engineer}/RC.{R. Childs} 6092 BY/RD.4/B.6.9.38. REGULATORS. We have obtained from Messrs. Lucas the identification number by which the new 2 1/2 turn regulator is to be known, i.e. B.2.CS/11. Included with the correspondence is a copy of their laboratory reports Nos. 6715 and E.4789 which give the following output figures. Open Circuit Operating Voltage (Cold) 15.8 - 16.3 volts. Output at | 13 volts. | 13.5 volts. | 15.5 volts. Cold. | 16.7 - 19.6 amps. | 13.8 - 16.7 | 3.2 - 5.9 Hot. | 20.4 - 23.2 amps. | 17.4 - 20.3 | 6.6 - 7.4 [Handwritten note] We agree with these figures Rm{William Robotham - Chief Engineer}/Rc{R. Childs} The above figures are all lower than those given on our detail drawing D.55030 which were obtained from the Expl. Dept. and are as follows :- Open Circuit Operating Voltage (Cold) 16.4 - 16.9 volts. Output at | 13.5 volts. | 15.5 volts. Cold. | 15 - 19 amps. | 8 - 12 amps. Hot. | 17 - 21 amps. | 10 - 14 amps. Owing to the discrepancies between the two sets of figures, we hand you herewith 2 regulators B.2.CJ/11 taken from the first production batch, for you to test and report on, to enable a specification to be drawn up. BY/RD. | ||