The Sensitometric Control of Sound Records on Film
Alfred Kuster, Richard A. Schmidt · Journal of the Society of Motion Picture Engineers · 1932
The paper describes a method of measuring gamma by means of the Agfa gammameter without its being necessary to make absolute measurements of density or plot sensitometric curves. The results obtained with this instrument are presented and are applied to a discussion of the Callier and Schwarzschild effects on the gamma of the variable density sound track.