George Christian Schaeffer (December 8, 1814 – October 4, 1873) was an American engineer, chemist, and librarian. Schaeffer was born in Harrisburg, Pennsylvania, and attended Columbia University, where his father served as a professor. As an engineer, he worked under David Bates Douglass from 1833 to 1836 in surveying and constructing the Croton Aqueduct, and from 1837 onwards served as an editor (and later sole owner) of the American Railroad Journal. He was the chief librarian of the Columbia University Libraries from 1839 to 1847, when he was appointed the chair of the Natural Philosophy, Chemistry, and Geology department of Centre College in Danville, Kentucky. He resigned after five years to become the principal examiner of the United States Patent and Trademark Office. Later, he woul
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