moderator lampn. now historical an oil lamp in which the flow of oil from the reservoir to the burner is maintained as a uniform flow by a regulating mechanism (cf. modérateurn.).
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moderator1851
moderator lamp1851
1851 Pract. Mechanic's Jrnl. Mar. 273 Hadrot's Moderator Lamp.
1904 Blackwood's Edinb. Mag. Apr. 469/1 New lampshades..decorated the globes of the moderator-lamps.
1977 J. FearnDomest. Bygones (1985) 26/2 The Moderator lamp of 1836 had a spring-loaded piston to feed fuel under pressure.