Abstract

List of symbols used in this and former papers.13

I

intensity of the exposure.

D

logarithmic density caused by the exposure.

γd

the differential coefficient dD/d log I at the density D.

γt

the total gradation, i.e., (D2D1)/(log I2−log I1) where 1 and 2 denote the lower and upper limit of the useful part of the density curve.

ΔD

the average fluctuation of the density, caused by the graininess.

ΔDa

the apparent average fluctuation of the density, to be corrected for the inertia of the galvanometer.

ΔDr

the true average fluctuation of the density, derived from ΔDa by correcting for the inertia of the galvanometer.

ΔK

the absolute graininess, i.e., ΔDr×(observedarea)12.

Δ log I

I/ID/γd: the average fluctuation of the intensity derived from ΔD.

ΔK log I

KI/IK/γd: the average fluctuation of the intensity derived from ΔK.

G

the average distance between the points of intersection of the line representing average density with the trace representing variations in density (this magnitude is canceled now, because it is merely a function of ΔD and of the scanned area).

L

the turbidity=the distance in the emulsion, where the intensity of the scattered light is half the intensity of the incident light.

Q

the micro-quality of the emulsion for a given application.

© 1937 Optical Society of America

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