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).
Instructions (page 2) investigating coil failure, suggesting mechanical stress on the insulating paper as the cause.
| Identifier | ExFiles\Box 69\1\ scan0273 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. (2) 19 To Order No. WD{Mr Wood/Mr Whitehead}101 (contd) Customer's No. insulating that layer to be unduly stressed mechanically. We have been suspicious of this on all the six coils recently unwound and we suggest that it may be the cause of the failure of the first layers on these coils. The effect is as follows [Diagram showing two layers of paper around a core] Diagram Labels: paper stressed here 2ND layer paper Primary connecting plate Flex 1ST layer In the case of V.I.85 coil the short had occurred about 1/2" along the circumference of the turns suggesting that the paper had been sheared. Signed H.E.W This Sheet must be filed on completion of the work. | ||