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 a Screw-Harmonic Balancer Jaw Retaining.
| Identifier | ExFiles\Box 125\1\ scan0308 | |
| Date | 30th January 1930 | |
| CADILLAC MOTOR CAR CO. DETROIT, MICH. S PART NAME: SCREW-HARMONIC BALANCER JAW RETAINING MATERIAL: G.M.C. #1112 STEEL OR 1035 STEEL NOTES: REFER TO HEAT TREAT SPECIFICATION NO 20. DULL CADMIUM PLATE 'B' EQUIVALENT TO G.M.C. #4252-M CLASS 'B'. SPECIFICATIONS: 1/2-20 AMER. THD. .4655 P.D. BEFORE PLATING .4675 'C' .4665 P.D. (CAD.) .4685 AFTER PLATING STAMPS: REQUISITIONED NOV 24 1936 CHANGE RECORD: MARK C | DATE: 3-8-34 | CHANGE RECORD: WAS .4665/.4685 P.D. | ORDER NO. C.R.4922 MARK B | DATE: 3-8-34 | CHANGE RECORD: WAS PARKERIZE | ORDER NO. C.R.4922 MARK A | DATE: 10-30-31 | CHANGE RECORD: NOTE ADDED | ORDER NO. G60190 DR. J.L. Thon CK.{Mr Clark} J.F. Kinger CHF. DFTS O.K. J.S. DECIMAL DIMENSIONS MUST BE MAINTAINED .010 EACH WAY CAN BE ALLOWED ON DIMENSIONS NOT OTHERWISE SPECIFIED. | ||