doi:10.7916/d8-m817-ry92Page No. 228 - Exhibit of Covel's dish-washers in Machinery Hall. These ingenious devices were located in Section 33, at Post T, Annexphotographsperiodicalsstill imageDishwashing machinesChicago (Ill.)Machinery Hall (World's Columbian Exposition, 1893, Chicago, Ill.)World's Columbian Exposition (1893 : Chicago, Ill.)