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).
Tests on the efficiency of blackening radiators, noting no change in efficiency but poor application quality.
| Identifier | ExFiles\Box 38\2\ Scan071 | |
| Date | 14th November 1919 | |
| To BY.{R.W. Bailey - Chief Engineer} from EH c. to BN.{W.O. Bentley / Mr Barrington} EH3/LG14.11.19. RE BLACKING OF RADIATORS. 8456 We have taken tests and find that there is no difference in efficiency with the radiator which has been blacked at the Works,(either Berlin black or Dead black) compared with the radiators as received from the Makers. I remember during the war, tests were carried out at the R.A.E. on some Hispano cylinders to prove the difference between a block of cylinders which were enamelled outside and another block which had not been enamelled. The results of the tests proved that the enamelled cylinder was, if anything, the better of the two for heat conducting. The only thing against the blacking as done by the Works, is that it is so badly carried out. On the radiators which were sent to us for test, the black came off in ones hands and certainly was not fit to send away on the Cars. EH. | ||