Interior of caisson before 1890

This anonymous illustration, titled "Interior of Caisson" and created before 1890, depicts a cross-section of a caisson, a watertight structure used in bridge construction. The detailed drawing, likely for an engineering publication, showcases the caisson's inner workings, including its material shafts, draft chamber, and other structural elements. This technical illustration offers a glimpse into the engineering practices of the late 19th century.