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).
Parts list and blueprint notification for the servo motor and mechanism of a 20/25-HP & Bentley standard type servo.
| Identifier | ExFiles\Box 105\4\ scan0132 | |
| Date | 17th March 1934 | |
| 45370 To: [struck through] c: Hs{Lord Ernest Hives - Chair}/Gry{Shadwell Grylls}; From: [struck through] BY/TWD{T. W. D???Aeith}1/E:17:3:34: 20/25-HP. & BENTLEY STANDARD TYPE SERVO. SERVO MOTOR & MECHANISM SECTION 6180. G:L:713. Torsional Connection of Servo Driven Plates by Spring Rings, and enclosed Friction Linings. N:Sch:3971: Torsional Connection of Servo Driven Plates by Spring Rings. Please receive herewith two blue prints of each of the following, and where a Forging is required, an extra blue print has been sent :- G:56762: Rivet. (Inner Pressure Plates). 2 off per set. (3 Prints) G:56763: Pressure Plate. (Outer). 1 " " " The above pieces have been produced at the Exptl. Dept's: request, (Ha/Gry.{Shadwell Grylls}17/KW.1:3:34:) and are required in order that the Torsional Connection of Servo Driven Plates by Spring Rings together with Enclosed Friction Linings (G:L:609), may be fitted to the 20/25-HP: and Bentley Chassis which have the standard type Servos; (Direct Braking to Rear only): The undermentioned pieces will also be required for use with the above :- G:B:1033: Friction Lining. 2 off per set. G:55660: Friction Plate. 1 " " " G:55663: Friction Plate Driving Disc. 1 " " " G:56701: Spring. (Pressure Plates) 1 " " " G:56703: Pressure Plate. (Inner). 1 " " " Alter- (G:56704: Driving Ring.Pres:Plates: 1 " " " natives:(G:56705: " " " 2 " " " G:56707: Washer. (Driving Ring). 4 " " " - 1 - | ||