Illumination levels
Subtitle: a brief explanation of the method of determining illumination levels developed by the "Medical research council and the Dept. of scientific and industrial research" of the British government
By: with Nomograph developed by the Holophane company, inc., that make the method easier to apply
Series: Bulletin -- no. 1
Published: 1947
Place of publication: New York
Language: eng
Number of pages: 10
Copyright date: 1947
Notes: Bibliography: 1. [9]