In 1731 he established in Philadelphia one of the earliest circulating libraries in America (often said to have been the earliest), and in 1732 he published the first of his Almanacks, under the pseudonym of Richard Saunders.
These " Poor Richard's Almanacks " were issued for the next twenty-five years with remarkable success, the annual sale averaging Io,000 copies, and far exceeding the sale of any other publication in the colonies.
Among De Morgan's miscellaneous writings may be mentioned his Explanation of the Gnomonic Projection of the Sphere, 1836, including a description of the maps of the stars, published by the Useful Know ledge Society; his Treatise on the Globes, Celestial and Terrestrial,1845, and his remarkable [[Book]] of Almanacks (2nd edition, 1871), which contains a series of thirty-five almanacs, so arranged with indices of reference, that the almanac for any year, whether in old style or new, from any epoch, ancient or modern, up to A.
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