thus giving a wedge of air
*
Fig. 5a.
Wheeler P. Davey (1886-1959 *). “Radiography of Metals.“ Transactions of the American Institute of Mining Engineers 53 (1916) : 150-160
University of California copy, digitized October 31, 2012
also Michigan copy (less good scans), digitized June 20, 2011
epigram p 157
tags:
could be a movie still; horizon; skiagraphy; wedge; W. P. Davey, “Radiography of Metals” (1916)