The Illuminating Engineer, Vol. 14: Jan. 1921 to Dec. 1921 (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from The Illuminating Engineer, Vol. 14: Jan. 1921 to Dec. 1921

A feature in the United States has been the rapid extension of the uses Of miniature glow lamps, largely for automobile headlights, but also for many Special purposes (special lamps for dentists and medical use, portable cinema outfits, The electric miners' lamp appears to be developing favourably in the United States; and in this country the discussion before the Illuminating Engineering Society in February emphasised the importance of improved lighting in mines with a view to checking the development Of miners' nystagmus. Portable flashlight lamps are finding many applications. A form Of apparatus developed in the United States utilises a Small hand driven magneto to supply current to the lamp, in place Of the customary dry battery.

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