United States. Surgeon-General's Office, American Roentgen Ray Society · New York : Middleditch · leaf 101
Fig. 49. Relation of target position to shadows and their overlapping. … Fig. 50. The relation between exposure and density of a photographicplate.Below A—under exposure. Beyond B—over exposure. OI—inertia of the plate. 94 X-RAY PHYSICS 95 would give a fairly good plate. On power such thaty% second is the best, an error of one second in judgmentor execution would exceed…
