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).
Providing recommendations for standard lamp bulbs and their specifications.
| Identifier | ExFiles\Box 166\4\ img041 | |
| Date | 1st January 1930 | |
| X6089 To Sg.{Arthur F. Sidgreaves - MD} from EPC. To E.{Mr Elliott - Chief Engineer} " PN{Mr Northey} " EP{G. Eric Platford - Chief Quality Engineer} _c._ to Wor.{Arthur Wormald - General Works Manager} _c._ to IV EP.{G. Eric Platford - Chief Quality Engineer} EFCL/ADS.1.30. X.8780. PERFORMANCE OF DYNAMO - BATTERY SYSTEM. X6089 In regard to lamp bulbs the following are our recommendations for standard :- Headlamp bulbs. 12-14 v.{VIENNA} 36 w. gasfilled, centre contact S.B.C. cap, BAS. 4.S. (Osram No. S.7012) Central lamp bulb. 12-14 v.{VIENNA} 48 w. centre contact, gasfilled, S.B.C. cap. (Osram No. S.7014) Side lamp bulbs. 12-14 v.{VIENNA} 4 w. vacuum, centre contact, S.B.C. cap (Osram No. S.7126) Tail lamp bulb. As side lamp bulb. Instrument lamp bulb. 16-18 v.{VIENNA} 3 w. Osram S.7954 with S.B.C. centre contact cap as arranged with G.E.Co. by R.R. Thermometer lamp bulb. As instrument lamp bulb on 40/50 HP. but on 20 HP. 16-18 v.{VIENNA} 3 w. Osram S.7954 with screw cap. Inspection lamp bulb. 12-14 v.{VIENNA} 6 w. vacuum, double contact, S.B.C. cap. BAS. 10.D. (Osram No. S.7168). Body lamp bulb. 12 v.{VIENNA} 9 w. half opal, vacuum, double contact S.B.C. cap. NB. The S.M.M. & T. standard side and tail lamp bulb is 12-14 v.{VIENNA} 6 w. vacuum, centre contact S.B.C. cap BAS. 10.S. (Osram No. S.7168) and these have been the bulbs we have so far recommended | ||