(DETROIT--CYANOTYPES) Group of approximately 57 photographs by Lloyd Construction Company of patents, construction sites, and machinery. A mini-archive of photographs from the gas works and apparatus manufacturing company, a major Detroit employer during the early 20th century. Including schematics for pressure valves, washer coolers, and condensers; detailed depictions of individual devices; large machinery in situ; and company warehouses and construction sites. Cyanotypes (27) and silver (30) prints, the images measuring 8 1/2x11 inches (21.6x27.9 cm.), some with numerical notations in the negative. 1909-13
