Sergey Prokudin-Gorsky

Dam’s slender abutment and part of the finished sill.Dam’s slender abutment and part of the finished sill.

A uniformed man standing near a dam abutment, more men posed in background.

Medium: 1 negative (3 frames); glass, b&w, three-color separation; 24 x 9 cm.

Source: https://www.loc.gov/pictures/item/2018681106/