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).
The performance and modifications for dipping headlights on the 20 HP model.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan23 | |
| Date | 1st January 1924 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. Expl. No. 4555 REF: Hs{Lord Ernest Hives - Chair}3/LG31 1 24. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RG.{Mr Rowledge} c. to DA.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} 20 HP. DIPPING HEAD LIGHTS. We have completed a set of dipping head lights arranged for the larger head lamps which are now standard on the 20 HP. The scheme has all the latest modifications sent through by WW. We find that the arrangement works very nicely. The addition of the friction in the operating lever is a great improvement. We doubt whether it is necessary to make the lever toggle now that we have the friction. We find that although the operating lever works with quite a light pressure, the friction is sufficient to hold the lamps in any position - we find 9° or 10° is sufficient tilt on the lamps when they are fully dipped. At present the operating lever moves through 100° - only 70° is necessary for dipping the lamps, the rest is toggle movement. We consider the tubes forming the horns for carrying the lamps are too weak - they bend apart allowing side play to develop which causes a rattle. They could, with advantage, be a larger dia. which would also allow more room to thread the wire through. The friction plate F.52823 is fixed to the control lever by means of push on parallel fit and round key. We found this soon developed slack and we altered it to a taper, it now appears satisfactory. Hs.{Lord Ernest Hives - Chair} | ||