Lámparas eléctricas para minas.
[Spain]: [Wolf Safety Lamp Co.], [ca. 1928]. Paperback. 79 pp., illustrations, printed wraps. 9.5 x 6.25 in. Head of spine bumped. Sheet with specifications for a lamp (Model No. 950) laid in, with some chipping to the left margin.
Catalog for alkaline battery-powered lamps used in mines. Alkaline lamps were developed in the late 1920s and prone to leaking battery fluid, but were a vast improvement on flame-based mining lamps. The introductory statement notes the safety benefits and improved worker efficiency that comes with a less volatile, portable light source and suggests that, at press time, butane lamps had been superseded by electric ones. The Wolf Safety Lamp Company was established in Leeds in 1880.