9781334184437 - The Illuminating Engineer, Vol. 10: Jan. 1917 to Dec. 1917 (Classic Reprint) de Society, Illuminating Engineering (3 resultados)

PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000.

Paperback. Condición: New. Print on Demand. In the early 20th century, with the advent of new forms of lighting and the development of new incandescent bulbs, the concept of the 'lumen' as a measure of the total light output from a source was proposed as a replacement for candlepower, the previous standard unit. This book explores the history, use, and application of the lumen. The author presents the arguments for the lumen as a measure of luminous power, examining how it provides a better representation of the total light output of a source than candlepower. The book also explains how the lumen can be used in practical lighting calculations, including how to determine the average illumination in a room and the efficiency of lighting fixtures. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.