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).
Data sheet specifying ratings and characteristics for tungsten filament electric lamps.
| Identifier | ExFiles\Box 166\4\ img046 | |
| Date | 1st August 1929 | |
| X6089 I.A.E. Data Sheet No. 104R. STANDARD S.M.M. & T. Provisional (BAS) Type Tungsten Filament Electric Lamps. STANDARDS DEPARTMENT. S.M.M. & T. Provisional Standard No. 6R. (BAS) Type Tungsten Filament Electric Lamps (Gasfilled and Vacuum). Revised August, 1929. Published in agreement with The Electric Lamp Manufacturers' Association of Great Britain, Limited. Table 1.—RATING, FILAMENT AND CAP. Columns: TYPE, FIG. NO., RATING (Volts., Watts.), FILAMENT (Length of Luminous Portion (Max. mm., Min. mm.), Shape and Position), CAP. (Fig., Torsion Test.). Row Group: HEAD LIGHTS (Gasfilled) Row 1: A, 1, 6, 12, 6, 6, Line, with 7 mm. (min.) between centre of filament and support, D or E, 10 lb. ins. Row 2: A, 2, 6, 18, 6, 4, Line, with 7 mm. (min.) between centre of filament and support, D or E, 10 lb. ins. Row 3: A, 3, 12, 24, 10, 6, Line, with 7 mm. (min.) between centre of filament and support, D or E, 10 lb. ins. Row 4: A, 4, 12, 36, 10, 6, Line, with 7 mm. (min.) between centre of filament and support, D or E, 10 lb. ins. Row Group: SIDE, TAIL AND DASH LIGHTS (Vacuum) Row 5: B, 8, 6, 3, —, —, V-shape, in approximate centre of bulb, D or E, 10 lb. ins. Row 6: C, 9, 6, 6, —, —, V-shape, in approximate centre of bulb, D or E, 10 lb. ins. Row 7: C, 10, 12, 6, —, —, V-shape, in approximate centre of bulb, D or E, 10 lb. ins. Table 2.—INITIAL RATING. Columns: TYPE, FIG. NO., RATING (Rated Volts., Rated Watts.), Initial Total Watts. (Max., Min.), Initial Rated Efficiency, Lumens per Watt. †, Initial Lumens, at Rated Volts. *, Ageing Period at Rated Volts. Row Group: HEAD LIGHTS (Gasfilled) Row 1: A, 1, 6, 12, 13.5, 10.5, 14, 168, One hour Row 2: A, 2, 6, 18, 20.3, 15.7, 15, 270, One hour Row 3: A, 3, 12, 24, 27.0, 21.0, 16, 384, One hour Row 4: A, 4, 12, 36, 40.5, 31.5, 17, 612, One hour Row Group: SIDE, TAIL AND DASH LIGHTS (Vacuum) Row 5: B, 8, 6, 3, 3.5, 2.5, 7.5, 22.5, Two hours Row 6: C, 9, 6, 6, 7.0, 5.0, 8.0, 48.0, Two hours Row 7: C, 10, 12, 6, 7.0, 5.0, 8.5, 51.0, Two hours * The Permissible Tolerance on Initial Rated Efficiency shall be ± 15 per cent. † The Permissible Tolerance on Initial Lumens shall be ± 20 per cent. P.T.O. 3 Sheets. Sheet No. 2. No. 104R | ||