Comparison of indirect and direct illumination (1912)
Habrylwicz, Valentine Bernard, Kailer, Frank Spencer · leaf 24
9 ILLUMINOMETER. The instrument used in these tests was a portable photometer capableof measuring the illumination in foot-candles directly. It was made by theSharp Millar Company, of Philadelphia. It is an ideal instrument having all the essential features formaking it suitable for all kinds of…
Interior lighting · Lighting · School Buildings · Theses
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
