An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 517
glass tube about 1 inch indiameter and 2 or 4 feet long,with mercury at the lower endand an iron or graphite elec-trode at the upper end. The tubeis exhausted so that the pres-sure is only 1 or 2 mm. Thecurrent will not flow throughthe tube from B to A (Fig. 32(3)unless there1 is a stream of… … Fig. 32G. - Diagram of mercury-vapor lamp. ELECTRIC LIGHTING 463 of this stream starts the arc. Generally an automatic start-ing device is used, which consists in causing a momentary highvoltage discharge across G to A by means of an induction coilL. This spark sets up enough vapor in the tube so…
Electricity · Magnetism
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