Citation

Pocock BW, Rhodes CC. Highw. Res. Board bull. 1951; 34: 40-54.

Copyright

(Copyright © 1951, National Research Council (U.S.A.), Highway Research Board)

DOI

unavailable

PMID

unavailable

Abstract

Photometric tests developed and now in use by the Michigan State Highway Department for reflectivity measurements and color determinations on reflex reflectors and diffuse reflecting materials are described. Detailed accounts of equipment and procedures used in both tests are accompanied by examples of data obtained and methods of computation. Some fundamental physical concepts and the significance of measurements are discussed briefly and several useful and interesting applications of the data are pointed out. Included are also photographs illustrating the apparatus now in use by the department.