American engineering standards committee: Illuminating engineering nomenclature and photometric standards

A revision of the Illuminating Engineering Nomenclature and Photometric Standards has been approved by the American Engineering Standards Committee as “American Standard.” The work includes the definition of present terms as well as a few additional ones used in illuminating engineering and photometry, together with the formulation of general principles to govern the measurement of light and illumination and the application of such measurements in practise.