[Halftones from photographs of the U.S. Patent Office Building in An account of the destruction by fire of the north and west halls of the model room in the United States Patent Office Building, on the 24th of September, 1877]

Walker, Lewis E. (Lewis Emory), 1822-1880 · 1877

"2 Half-tones (planographic) from photographs of the U.S. Patent Office Building. Clear dot pattern from a cross-line screen, or a single line crossed during exposure...Heliotype Printing Co., Boston (half-tones)."--Hanson Collection catalog, p. 57