Chicago : [Popular Engineering Pub. Co.] · leaf 131
POPULAR ELECTRICITY 105 … and vaporizing over and THE QUARTZ LAMP over again. The light is a beautiful whitish yellow, of the spectrum went right through quartz, faintly tinged with green, very brilliant and while they are arrested by ordinary lead glass. This sounds only scientific and of powerful, giving about the same…
Electricity
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
