Contains articles, clippings, photographs, broadsides, pamphlets, notebooks, reports, blueprints, patents, notes, catalogs, manuals, manuscript documents, and exhibit scripts concerning the history of electrical science and technology. Subject divisions of the collection include wireless, radio, television, and telegraph equipment; electronic testing apparatus; transistors; lasers; power equipment; sound spectrography; submarine telegraphy; radio astronomy; electron microscopes; and communications satellites.