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Expired
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Alfred Julius Boult
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Individual
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Individual
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Publication of GB190201675ApublicationCriticalpatent/GB190201675A/en
1675. Boult, A. J., [Martin, P.]. Jan. 21. Gas and like engines, igniting in. The insulated member of the sparking - plug is constructed of two kinds of metal, so that their expansion shall equal that of the insulator. The terminal h is made of iron, and is screwed into a long copper nut k, which retains it in the porcelain sleeve b ; their expansion equals that of the sleeve between the shoulders m, m. The body of the plug a and the gland f may be constructed so as to expand equally with the enlarged part of the insulator.
GB190201675D1902-01-211902-01-21Improvements in or relating to Sparking Plugs For Motors.
ExpiredGB190201675A
(en)