21 black and white photometry and similar photographs, probably created by Charles F., Sr., during his experiments, around 1909 Charles F. Brush, Sr., Show more21 black and white photometry and similar photographs, probably created by Charles F., Sr., during his experiments, around 1909 Charles F. Brush, Sr., Papers Series 13: Photographs and Drawings (1880s-1954) Box 39 Folder 7 Show less