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).
Drawing of a special 10 A3 cover, detailing modifications and manufacturing specifications.
| Identifier | ExFiles\Box 129\4\ scan0078 | |
| Date | 21th September 1936 | |
| 12.312"/12.310" DIA^R MACHINE COVER TO THIS DIAMETER (SEE NOTE RE-LOCATION ETC) .3775"/.376" DIA^R REAM ONE ADDITIONAL HOLE ON 11.627"/11.623" P.C.DIA^R NOTE:- THE LIMITS FOR CONCENTRICITY OF BOLT CIRCLE & PERIPHERY OF COVER, IN RELATION TO LUG SLOTS, AND TO ONE ANOTHER, MUST BE WITHIN ±.002" FOR OTHER DIMENSIONS SEE DRG N^O 40296/1. REMOVE EXISTING PART N^O 40296 AND STAMP ON PART N^O 41252. AT BORG & BECK BALANCE STRIP WELDED TO COVER FLANGE THUS. BORG & BECK CO, LTD LEAMINGTON SPA, ENG. 41252. MAKE FROM 40296. All Dimensions ± .015 Unless Otherwise Stated. All Corners Free From Fraise. Work to Dimensions Do Not Scale. This Print supersedes any issued previous to latest alteration date. It is Our Property and must be returned upon request. This Print must not be sold to any other concern. F = Good Finish O = Rough G = Ground ⊕ = Machine All Over BORG AND BECK CO. LTD. LEAMINGTON SPA. ENGLAND. DRAWN J.C.V. 6.1.35 TRACED D.L. 21.9.36 CHECKED PASSED DESCRIPTION: COVER · 10 A3 · SPECIAL Rolls Royce MATERIAL: STEEL PRESSING SPECIFICATION: A.P.I. HOT ROLLED PICKLED & OILED PART No.: 41252/2 No. OFF PER SET: 1. ALTERATION No. DATE ALTERATIONS READ UP FORM B 11/P | ||