Actinometry of the Photographic Intensity of Artificial Light Sources [Aktinometrie der photographischen Licht-Intensität künstlicher Lichtquellen]

Actinometry of the Photographic Intensity of Artificial Light Sources [Aktinometrie der photographischen Licht-Intensität künstlicher Lichtquellen]

Author: Josef Maria Eder

Year: 1912

Aktinometrie der photographischen Licht-Intensität künstlicher Lichtquellen [ Actinometry of the Photographic Intensity of Artificial Light Sources] from Josef Maria Eder , Ausführliches Handbuch der Photographie , Third Edition, Volume I, Part 3: Die Photographie bei künstlichem Licht, Spektrumphotographie, Aktinometrie und die chemischen Wirkungen des farbigen Lichtes (Wilhelm Knapp, Halle a. S., 1912). Summary This chapter is one of the most comprehensive early twentieth-century studies of the actinic (photographic) intensity of artificial light sources. Josef Maria Eder reviews the historical development of photographic actinometry before presenting extensive experimental investigations into the photographic effectiveness of magnesium ribbon, magnesium powder, flash powders, aluminium, phosphorus, gaslight, limelight, electric arc lamps, and mercury-vapour lamps. Particular attention is given to the distinction between optical brightness and photographic effectiveness, expressed by Eder as relative actinity —the ratio of photographic to visual intensity. The chapter establishes practical methods for measuring the chemical (photographic) brightness of artificial light sources us