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).
Provisional standard for Type Tungsten Filament Electric Lamps (Gasfilled and Vacuum), including dimensions for a small bayonet cap holder.
| Identifier | ExFiles\Box 166\4\ img048 | |
| 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.{Mr Moon / Mr Moore} M.{Mr Moon / Mr Moore} & 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. FIG.F. SMALL BAYONET CAP HOLDER. Minimum thickness of plain portion of shell, 0.022 in. Table 4. DIMENSIONS OF SMALL BAYONET CAP HOLDER. REFERENCE LETTER | DIMENSIONS. -------------------|--------------------------|--------------------------- | Maximum. | Minimum. | in. | mm. (approx.) | in. | mm. (approx.) -------------------|--------|-----------------|--------|----------------- A | 0.610 | 15.49 | 0.605 | 15.37 B | 0.280 | 7.11 | 0.240 | 6.10 C | 0.040 | 1.02 | 0.030 | 0.76 D | 0.111 | 2.82 | 0.107 | 2.72 E | 0.160 | 4.06 | 0.140 | 3.56 F | 0.193 | 4.91 | — | — G | — | — | 0.386 | 9.80 H | 0.125 | 3.17 | 0.105 | 2.67 J | 0.056 | 1.42 | 0.054 | 1.37 J is an arc of a circle, radius D/2. The spring pressure on each plunger shall be :— With bulb in position .. { 4 lb. 8 oz. maximum. { 3 lb. 8 oz. minimum. With bulb removed .. .. 12 oz. minimum. 3 Sheets. Sheet No. 3. No. 104R | ||