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).
Specifications and dimensions for a small bayonet cap tungsten filament electric lamp.
| Identifier | ExFiles\Box 166\4\ img047 | |
| Date | 1st August 1929 guessed | |
| (BAS) Type Tungsten Filament Electric Lamp FIG.D.--SMALL BAYONET CAP. 2 Pin Double Contact. Minimum clear internal depth at centre of vitrite. Minimum thickness of shell, 0.007 in. (0.178 mm.). FIG.E.--SMALL BAYONET CAP. 2 Pin Centre Contact. Hole for wire for shell contact. Table 3.--DIMENSIONS OF SMALL BAYONET CAP. REFERENCE LETTER | OBJECTIVE DIMENSIONS. 2 Pin Double Contact or 2 Pin Centre Contact | 2 Pin Double Contact only. | 2 Pin Centre Contact only. in. | mm. (approx.) | in. | mm. (approx.) | in. | mm. (approx.) A | 0.596 | 15.14 B | 0.689 | 17.5 C (approx.) | 0.079 | 2.0 D | 0.246 | 6.25 D1 (Max.) | 0.296 | 7.52 E | 0.077 | 1.96 F | 0.055 | 1.40 G | | | 0.344 | 8.74 H | | | 0.156 | 3.96 J (Min.) | | | 0.140 | 3.56 K | | | | | 0.187 | 4.75 L | | | | | 0.046 | 1.17 N | 0.512 | 13.0 3 Sheets. Sheet No. 2. No. 104R | ||