Éleuthère Irénée du Pont de Nemours (1771–1834) was a French American chemist and industrialist who founded the gunpowder manufacturer E.I. du Pont de Nemours & Company. E.I. du Pont married Sophie Dalmas du Pont (1775-1828) in 1791; the couple had eight children, one of whom died in infancy. This collection of papers includes outbound and inbound correspondence covering personal and business matters. These include personal accounts, writings and memoirs, legal documents, and miscellany, of which the majority are accounts. There are papers of the E.I. du Pont de Nemours & Co. that date from 1802 to 1850 and include correspondence (drafts, retained copies, and letters received), contracts and other legal documents, accounts, bills and receipts, checks, promissory notes, bills of exchange, drafts, and certain miscellaneous notes and memoranda.

The Fitz Water Wheel Company specialized in the manufacture of water wheels and small power plants, although it also manufactured grain dryers and blowers. John Fitz (1847-1914), who succeeded his father as head of the firm, developed the modern steel overshot water wheel. These photographic prints are transfers from the Fitz Water Wheel Company manuscript collection. They document different residential and commercial sites where Fitz Water wheels were installed.

Campbell Waterwheel Company specialized in traditional water wheels and how they could be used as esthetic elements in the landscape. Consequently, much of the company's work was for decorative power plants for private estates or for historic restorations. The collection consists of photographs of an unidentified electrically-powered water wheel.

Campbell Waterwheel Company specialized in traditional water wheels and how they could be used as esthetic elements in the landscape. Consequently, much of the company's work was for decorative power plants for private estates or for historic restorations. The collection consists of graphic materials related to J.B. Campbell and the Campbell Water Wheel Company. The bulk of the collection contains photographs of company projects, arranged alphabetically by client or contractor name. These include views of water wheels, turbines, and water supply systems during various stages of installation. There are also views of mills, dams, flumes, hydroelectric power plants, irrigation gates, swimming pools, and hydraulic machinery.

Lukens Steel Company was a medium-sized producer of specialty steel products and one of the top three U.S. producers of steel plate. The Lukens Steel Company records documents all aspects of the business from the early nineteenth century through the 1970s.

The Niagara Falls Power Company began in 1890, the power plant harnessed waterpower to deliver electricity to Buffalo, New York. The company's two power stations were closed after more than sixty years of service in 1961. This collection's photographs document the erection of wooden poles for power transmission lines between Niagara Falls and Buffalo. There are also interiors and exteriors of power hosues and transformer buildings.