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 detailing the dimensions for Guide Groove No. 6 for a duplex chain.
| Identifier | ExFiles\Box 128\3\ scan0144 | |
| Date | 24th September 1931 | |
| DO-1967 GUIDE GROOVE NO.6 .250R. .295 .310 .125 B .265 .275 -.03125R. C .2784 .2934 A REVISION TABLE: CHG. NO. | DATE | SYM | REVISION 662 | 7-18-25 | | Released 689 | 8-10-25 | A | .015R REMOVED FROM CORNERS 2944 | 9-24-31 | B | WAS .301-.311 2944 | 9-24-31 | C | WAS .275-.290 CAUTION: DO NOT SCALE BLUE PRINT A TOLERANCE OF PLUS OR MINUS .010 IS ALLOWED ON ALL DIMENSIONS UNLESS OTHERWISE SPECIFIED TITLE BLOCK: MORSE CHAIN COMPANY, ITHACA, NEW YORK DETROIT OFFICE - DETROIT, MICH TITLE: GUIDE GROOVE DIMENSIONS FOR DUPLEX CHAIN SCALE: TEN TIMES SIZE DRN: C.J.C DATE: 5-1-25 DO-1967 | ||