Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 247
a part of the mer-cury and the whole tube becomes filled with mer-cury vapors. These are brought to incandescenceby the current passing through them, thus produc-ing light of a pale blue-green tint. The light con-tains no red rays, and casts no sharp shadows.fig. 104. It is very favorable for the…
Electrical engineering
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