Son of Richard H. Day, Charles A. Day graduated from Germantown Academy before entering the University of Pennsylvania's program in Engineering. In 1899 he obtained a B.S. in Electrical Engineering, followed by the M.S. in 1903. Even before graduation he was employed at the Link-Belt Engineering Co. in Nicetown, an operation headed by John Mapes Dodge, father of his friend from Germantown Academy days Kern Dodge. After Kern Dodge graduated from Drexel Institute in 1901, the two established Dodge & Day, engineers; but after a transition with Dodge, Day & Zimmermann, Kern Dodge withdrew from this enterprise in 1912, and Charles Day continued with the succeeding firm of Day & Zimmermann.
Charles Day both wrote and lectured on engineering practice. His book Industrial Plants: Their Arrangement and Construction, published by Engineering Magazine as a monograph in 1911, actually grew out of a series of lectures for Harvard University's Graduate School of Business Administration.
During World War I Day also served on the U. S. Shipping Board Emergency Fleet Corporation and became a member of the Army War Council.
Sandra L. Tatman.
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