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 points requiring attention for the Wraith III Oil Level Indicator, part number E.CD.255.
| Identifier | ExFiles\Box 108\2\ scan0045 | |
| Date | 8th March 1938 | |
| To DY.{F R Danby} from HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} (DY.{F R Danby} is struck through) c. to Ds. (Ds. is struck through) c. to Rm.{William Robotham - Chief Engineer} C. to HPS.{Horace Percy Smith - Experimental Factory Mgr} (HPS.{Horace Percy Smith - Experimental Factory Mgr} is struck through) c. to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} (Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} is struck through) 600. HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth}1/VS.{J. Vickers}8.3.38. WRAITH III. Oil Level Indicator (E.CD.255). Further to memo HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth}1/VS.{J. Vickers}26.2.38, we give below a list of points requiring attention on the above unit. 1. The external link to the oil level indicator is produced in soft brass wire; we would suggest it be made from a material less easily damaged. 2. To calibrate the indicator it has been found necessary to add weight to the cork float. This has been done by inserting a mild steel disc (22 SWG. and 7.6 grammes in weight) between the two halves of the float. With this addition calibration is similar to the existing Wraith indicator. 3. E.50262 rivet is called for on LOP. to be fitted in the pointer, but when this is used it is impossible to remove the external link. We recommend the use of EW.1610 pin at both ends of the link as shown on E.CD.255. 4. EW.1612 pointer calls for black enamel finish, while EW.1614 bush and EW.1610 pin, which are fitted to the pointer, require nickel deposit; we suggest all these details be enamelled as one unit after assembly. 5. EW.1613 spindle and EW.1614 bush are both produced in mild steel; we would suggest the spindle be made in bronze to avoid the danger of the two parts seizing up on account of rust. 6. No lower half joint washer appears to have been detailed in connection with the modified position of the oil level indicator. HPS{Horace Percy Smith - Experimental Factory Mgr}/R.{Sir Henry Royce} Hollingworth. | ||