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).
Test results for four returned calorstats from different chassis.
| Identifier | ExFiles\Box 156\2\ scan0160 | |
| Date | 24th November 1938 | |
| 1328 & 561 To Hd.{Mr Hayward/Mr Huddy} from Rm{William Robotham - Chief Engineer}/Std. c. D/BP. c. Roy{Sir Henry Royce}/JT. Rm{William Robotham - Chief Engineer}/Std.7/MH.{M. Huckerby}24.11.38. With regard to various calorstats which have been returned to us for examination, the following are the results of our tests:- Calorstat ex chassis GRO.28 - defective - fails to operate. " " " GWN.23 - Defective - starts to open 10° low. " " " GRP.38 - Defective - starts to open 4°C late. " " " GHO.25 - correct - opens correctly. These units have been returned by Roy{Sir Henry Royce}/JT. for examination and rectification, with the exception of unit ex chassis GHO.25 which is not defective. In the other three cases, the repairs should definitely be F.O.C. Rm{William Robotham - Chief Engineer}/Std. | ||