Description: Papers of Arthur C. Willard, Professor of Heating and Ventilating (1913-1934), Head of the Department of Mechanical Engineering (1920-1934), Acting Dean of the College of Engineering and Director of the Engineering Experiment Station (1933-1934) and President of the University (1934-1946), including correspondence, addresses, notes, reports, blueprints and tracings, reprints of articles, technical literature, catalogs, tests data, statistical material, photographs and clippings relating to courses, consulting services, research programs, professional associations and university and departmental administration. Consulting services relate to the ventilation of the Holland Tunnel, the Midtown Hudson Tunnel, the Chicago Subway and the St. Louis Subway.