Classification and rules, Department of Electricity : with other information for intending exhibitors
A regulations booklet issued in 1893 by the Department of Electricity of the World's Columbian Exposition in Chicago, addressed to firms planning to exhibit. Its single plate is a folded site plan of Jackson Park beside Lake Michigan, with a bird's-eye view of the exposition grounds below it, showing the layout of pavilions, lagoons and the lakeshore. A designer might draw on the dense, ruled line work of these period maps and aerial views for architectural or civic diagrams.
