Man electrically testing pipe coating for defects, Detroit water supply system
Description:
View of a man electrically testing pipe coating for defects, Detroit water supply system. Printed on front: "City of Detroit. Department of Water Supply. 36" and 72" underground water distribution main. Contract no. 1. PWA docket Mich. 1517-F. G. Vella Company, contractors. Electrically testing coating for defects. No. 5. Date: May 15, 1939. Photo by Manning Bros., Inc."
