. Light and lighting. SOME STAGES IN THE MANUFACTURE OF ROYAL EDISWAN LAMPS AT PONDER S END. 536 THE [LLUMINATTNG ENGINEER (nov.) THE BRIMSDOWN LAMP WORKS. By tin- courteous permission i t theBrimsdowii Lamp Works Ltd. .Middle-sex) we were recently afforded an oppor-tunity of seeing bow Wiruna lampsare made. This lamp has Beveral inter-esting features and we were able toit made from - tarl to finish. The operations involved in mounting all metallic filaments within lamp bulbs are now fairly well standardised. Bui thefilament used in these lamps h remark-able in that its ductility is produced n
. Light and lighting. SOME STAGES IN THE MANUFACTURE OF ROYAL EDISWAN LAMPS AT PONDER S END. 536 THE [LLUMINATTNG ENGINEER (nov.) THE BRIMSDOWN LAMP WORKS. By tin- courteous permission i t theBrimsdowii Lamp Works Ltd. .Middle-sex) we were recently afforded an oppor-tunity of seeing bow Wiruna lampsare made. This lamp has Beveral inter-esting features and we were able toit made from - tarl to finish. The operations involved in mounting all metallic filaments within lamp bulbs are now fairly well standardised. Bui thefilament used in these lamps h remark-able in that its ductility is produced notmechanically, but by purely chemical mean-. The drawn wire filament i- gradually pulled oul t grealfineness. In this case the filament is,mi to speak, pushod out. The metal isfirsl reduced to a convenient plasticcondition, and certain materials areadded to jt which subsequently combinewith the tungsten t> form highly ductilealloy. \- the filament emerges from the pressit i- Don-conducting excep
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