Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 546
ion. This process is carried outin tv . the lamp- l» ling firsl put on :i» ,i rough vacuum pump, and after-wards on to a finishing pump so ensureobtaining a p turn. During this tion, a eurrenl is passed through thefilamenl bo as to drive off any occludedWhile a<t ually on the pumps t hebulb is… … Stemming the bulbs of Wotan lamps
Lighting
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
