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).
Blueprint comparing box spanner clearances for the 25/30 & Bentley II against the Wraith & Bentley III models.
| Identifier | ExFiles\Box 132\3\ scan0091 | |
| Date | 10th March 1938 guessed | |
| Ex.I.258. 4.650" +2 -2 4.250 +25 -25 MACHINED FACE MARKED III 5.275 +2 -2 4.875 +25 -25 MACHINED FACE MARKED III .795" DIA. OF SPANNER USED IN WORKS 25/30 & BENTLEY II WRAITH & BENTLEY III DISTANCE BETWEEN OUTER WALL AND CENTRE OF HOLE = .400" +27 -27 DIAM. OF SPANNER IN GENERAL USE IN WORKS. = .795" CLEARANCE BETWEEN OUTER WALL & SPANNER = .0025" +27 -27 IT IS THUS POSSIBLE FOR THE SPANNER TO FOUL THE OUTER WALL BY .0245" COMPARATIVE BOX SPANNER CLEARANCES. ...ROYCE. LTD. PRINT ROOM DERBY | ||