Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 172
at regularintervals and polished to uniformitywhen necessary. The nature of thetungsten metal, prior to the drawing ofwire, and also as present in the completefilament, is also examined closely byphoto-micrography and visitors wereshown the process of making such micro-photographs. Records are… … Swaging and Wiredrawing Machines. in our journal, and is familiar to reader-.Operations fall into three main divisions—the making of the filament, the treat-ment of glass bulbs involved in settingthe filament in position, and the ex-haustion and filling of the lainp-bulbswith suitable gas (in the…
Lighting
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