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).
Alteration notice for Avro engine parts concerning retrogressive lap specifications for coils and commutators.
| Identifier | ExFiles\Box 68\4\ scan0173 | |
| Date | 8th June 1928 | |
| ALTERATIONS TO OT-H.4.9 R.R. AVRO ENGINE PARTS. (upside down text) R.R. 29 (2) HSI. I-II.6B 8.6.28. (upside down text) Description of Parts (upside down text) Origin (upside down text) Experimental Test Report (upside down text) (4) (2) Retrogressive lap. Pitches Forward 9. coil 4 slots Backward 11. com 5 slots Step 1 to 5 (Same as Retrogressive wave Piece 9. 4 slots coil) 5 slots com) Up Down 1 10 19 8 17 6 15 4 13 2 11 20 9 18 7 16 5 14 3 12 (Columnar form text, all upside down) Cost of Parts in Works and Stores | Signature of Exp.L Dept. that above is correct which are scrapped, if commenced | Cost of Old Part | Weight of Old Part on: no | Cost of new Part | Weight of new Part As advised above | Difference per Engine | Difference per Engine Notations | Signature of Mr DeLoose that above is correct Signature | DATE | SIGNATURES REMARKS | M.{Mr Moon / Mr Moore} JOHNSON. | M.{Mr Moon / Mr Moore} ROYCE. | M.{Mr Moon / Mr Moore} WORMWALD. | M.{Mr Moon / Mr Moore} NAYDIN. | M.{Mr Moon / Mr Moore} PLATFORD. | M.{Mr Moon / Mr Moore} BAILEY. | ||