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 for Armature Stampings D.B.511 and D.B.512.
| Identifier | ExFiles\Box 62\3\ scan0450 | |
| Date | 21th December 1933 | |
| DS4296/7 D.B.511. D.B.512. 4258 D 24 SLOT EQUALLY SPACED. STAMPINGS TO BE INSULATED WITH INSULINE ON ONE SIDE ONLY. REPLACE ALL COPIES TO EXP. PATT. WORKS. FORGE T.O. S.R. D.O. R.{Sir Henry Royce} R.D. AMERICA. T.D. COST. DRAWN. AW TRACED. CHECKED. APPROVED. LIMITS O.K. DATE 21-12-33 USED ON BENTLEY NO OFF 8070 SECTION ROLLS-ROYCE, LTD PRINT ROOM 25 SEP 1934 LOCATING MARK .050 DIA +5 D.B.511 .014 THICK 222 OFF. D.B.512 .064 THICK 16 S.W.G. 2 OFF. SCALE 1/1 MACHINE ALL OVER OR WHERE MARKED THUS HEAT TREAT BRINELL STANTON TITLE. ARMATURE STAMPING MATERIAL SANKEYS SPEC N° STALLOY OPERATION MACHINE TOOL TOOL NO NO R.R. 774 (20H)(47542-3-6-33) N L 3.100 DIA +0 -2 .970 DIA +0 -3 .725 +10 -10 .525 +10 -0 .1875 +2 .050 R | ||