These records consist of correspondence, reports, proposals, estimates, and drawings concerning various aspects of the Smithsonian physical plant, with emphasis on
early electrical, heating, and ventilating systems in the Smithsonian Institution Building, the Arts and Industries Building (A&I), the Freer Gallery of Art, the Smithsonian
Astrophysical Observatory, the National Zoological Park, the Natural History Building (NHB), the National Cathedral, and the Library of Congress.