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).
Analysis of cable replacement procedures, points of failure, and improvements to cable material to prevent ozone damage.
| Identifier | ExFiles\Box 168\1\ img228 | |
| Date | 15th June 1935 guessed | |
| -2- The valuable information which comes from the test in question is that it makes it clear to us that when we replace a cable in a set, we should remove the whole of the cables from the tube, and certainly scrap the two longest ones, in addition to the one at fault, and then slide the 6 cables back into the tube so that there is no torsional twisting on any cable. The evidence goes to show that it is quite possible in replacing a single cable, the perfectly natural method of sliding in by twisting is being resorted to, as the cable will move forward more easily if it is made to slide by twisting, and whilst this point may not have been understood, there appears to be no doubt it is fully appreciated in practice. Care should be taken to ensure that no unnecessary twists are put on the cable when fitting the terminal end to the plug. From other cables we have received it is clear that the point of failure is where a bend has occurred. The bend in question most probably occuring at the end where the cables leave the tube. We would like to add, that improved cable has been standardised, the improvement consisting in a layer of material being added over the rubber, which is not subject to attack by ozone. The ozone being formed by the brush discharge where the cable closely approaches the earth metal. BY | ||