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. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.