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History of U.S. Army Engineer Topographic Laboratories, (1920-1970).
This document presents the historical development of the Engineer Topographic Laboratories from the period immediately following World War I to 1970. It includes a description of the major research and development programs of that period and listings in the Appendices of technical personnel responsible for these research and development programs as well as listings of technical reports published. (Author).
Two Approaches to a Portable Color-measuring System
Two approaches to color measurement are presented, the spectrophotometer and the reflectometer. Descriptions are given of two portable instruments, one of each type. The first instrument was built using a flashlight lamp as light source, a wedge interference filter as monochrometer, and a cadmium sulphide photoresistor as a detector. The second instrument was built with three filters which provided the tristimulus curves of the CIE standard observer, a flashlight lamp, and three barrier layer cells as detectors. (Author).
