Samuel Alsop, Headmaster 1846–1853. Upon John Bullock’s death, Samuel Alsop, a Philadelphia Quaker, scholar, mathematician, and teacher at the Bullock School, becomes headmaster. He runs the school until 1853, when he sells his interests to Theodore Hyatt. Pictured is a page from Alsop’s A Complete Key to Gummere’s Surveying, 1837.