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).
List of standardisation sheets for the 20 HP chassis, authorised between November 1923 and July 1924.
| Identifier | ExFiles\Box 29\2\ Scan096 | |
| Date | 18th July 1924 | |
| STANDARDISATION SHEETS AUTHORISED FROM THE 1st NOVEMBER 1923 TO DATE 18.7.24. 20 H.P. CHASSIS. Date of Issue | X No. | Description. | Increase £. s. d.{John DeLooze - Company Secretary} | Decrease £. s. d.{John DeLooze - Company Secretary} | REMARKS. --- | --- | --- | --- | --- | --- 17.11.23 | √ X 4067 | Shorter Instrument Board Brackets | - - - | - - - | No difference in cost 31.10.23 | √ X 4081 | Switch Box arranged to be put in from the back of the Instrument Board | - 1 5 | - - - | 30.10.23 | √ X 4226 2764 | Material for Valve | - - - | - - - | No difference in cost 30.10.23 | X 3596 | Petrol Level Indicator | - - 6 | - - - | 4.10.23 | X 4229 | Camshaft | - - - | - - - | No difference in cost. 25.10.23 | X 4226 | Petrol Tank Filler Cap. | - - 7 | - - - | 3.10.23 | X 634 | Friction Damper to Engine Mounting | 1 11 2 | - - - | 16.8.23 | X 4238 | Exhaust Pipe lagged with Asbestos | - 1 3 | - - - | } Two Sheets of same No. 21.12.23 | √ X 4238 | Reduce Dia. Swan Neck Exhaust Pipe. | - - - | - - - | } No difference in cost 12.1.24 | √ X 157 | Liquall Petrol Filler | - 3 6 | - - - | 21.1.24 | √ X 4344 | Friction Discs for Slipper Wheel | - 2 8½ | - - - | 15.1.24 | √ X 4272 | Undershield | - - - | - 3 8 | 17.3.24 | √ X 4181 | Improved Type of Contact Breaker for E.C.6. Magneto | - - - | - - - | 15.4.24 | √ X 4238 | Stay for Exhaust Pipe | - 1 7 | - - - | 29.4.24 | √ X 4228 | Carburetter air inlet | - 9 3 | - - - | 13.4.24 | √ X 370 1 | Gauze for Petrol Filter | - - - | - - - | 20.5.24 | √ X 1918 | K.L.G. Sparking Plugs | - - - | - - - | 11.6.24 | √ X 3524 | Improved Luggage Grid. | - 3 6 | - - - | | | | 2 15 5½ | - 3 8 | 22.1.24 | √ X 2628 4261 | 20% Stronger Road Springs | 2 0 0 | - - - | For Export Chassis. 25.3.24. | √ X 4333 | Morganite E.G.2. Quality Brushes for 20 H.P. Dynamo. | - - 11 | - - - | Second source of supply. | ||