Definitions; specifications; dimensions, initial rating and life performance of vacuum traction and gas filled traction lamps; dimensions of B.22/25 × 26 lamp caps and E.27/25 lamp caps; metal socket adaptor for torsion test.
British standard specification for traction lamps (series burning) (formerly part of B.S. 555 -- 1935)
Brit Standards Instn -- Brit Standard Specification
1939
29 pages
Standard
English
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