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).
Suggestion to replace 60 watt headlamp bulbs with 48 watt bulbs to better manage battery discharge and to standardize all bulbs used in the chassis.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan190 | |
| Date | 9th January 1931 | |
| FROM E.{Mr Elliott - Chief Engineer} Cp. to Cor. WCH. spoke per phone C. to HS.{Lord Ernest Hives - Chair} EFC. ORIGINAL DYNAMO OUTPUT. RECEIVED 11/W9.1.31. X6084 X6089. Before leaving Derby we suggested that the 60 watt bulbs in use on our headlamps should be replaced by 48 watt, not with a view to passing the trouble on to the customer but because we think the smaller power bulb with the ammeter showing a 'plus' charge would give as much light as the 60 watt running with a battery discharge, and at the same time there would be less liability for the battery to be run down. Up till the beginning of last year the 36 watt bulb was our only official standard but it appears that at some time in May the 60 watt was included as an alternative on the list. It might be a good scheme to circulate a standardisation sheet for any alteration of this nature, and to set out in the instruction book a list of the bulbs that should be used throughout the electrical installation of the chassis. E.{Mr Elliott - Chief Engineer} | ||