Life and Work
Nathaniel Bowditch, the fourth of seven children, was born in Salem, Massachusetts, to Habakkuk Bowditch and Mary (Ingersoll) Bowditch. At the age of ten, he was made to leave school to work in his father's cooperage, before becoming indentured at twelve for nine years as a bookkeeping apprentice to a ship chandler.
In 1787, aged fourteen, Bowditch began to study algebra and two years later he taught himself calculus. He also taught himself Latin in 1790 and French in 1792 so he was able to read mathematical works such as Isaac Newton's Philosophiae Naturalis Principia Mathematica. He found thousands of errors in John Hamilton Moore's The New Practical Navigator; at eighteen, he copied all the mathematical papers he found in the Transactions of the Royal Society of London. Among his many significant scientific contributions would be a translation of Pierre-Simon de Laplace's Mécanique céleste, a lengthy work on mathematics and theoretical astronomy. This translation was critical to the development of astronomy in the United States.
Serendipity aided Bowditch's self-directed study, in as much as he found himself able to use the eminent Irish chemist Richard Kirwan's library: a privateer from Salem known as the Pilgrim, which Nathaniel had an expectation on at age 6, had intercepted the ship carrying the library between Ireland and England and brought the library back to Salem in June 1791.
In 1795, Bowditch went to sea on the first of four voyages as a ship's clerk and captain's writer. His fifth voyage was as master and part owner of a ship. Following this voyage, he returned to Salem in 1803 to resume his mathematical studies and enter the insurance business. (One of his family homes in Salem, the Nathaniel Bowditch House, still exists and has recently been restored.)
In 1798 Bowditch married Elizabeth Boardman, who died seven months later. In 1800 Bowditch married his second wife and cousin, Mary (Polly) Ingersoll Bowditch (1781–1834). They had 2 daughters and 6 sons, including Henry Ingersoll Bowditch. Among his grandchildren was Henry Pickering Bowditch. He has 2,356 descendants, most of them living in America.
In 1802, Harvard University awarded Bowditch an honorary Master of Arts degree.
In 1804, Bowditch became America's first insurance actuary as president of the Essex Fire and Marine Insurance Company in Salem. Under his direction, the Company prospered despite difficult political conditions and the War of 1812.
Bowditch's mathematical and astronomical work during this time earned him a significant standing, including election to the American Academy of Arts and Sciences in 1799 and the American Philosophical Society in 1809. He was offered the chair of mathematics and physics at Harvard in 1806, but turned it down. In 1804, an article on his observations of the Moon was published and in 1806 he published naval charts of several harbors, including Salem. More scientific publications followed, including a study of a meteor explosion (1807), three papers on the orbits of comets (1815, 1818, 1820) and a study of the Lissajous figures created by the motion of a pendulum suspended from two points (1815).
As well as Harvard, the United States Military Academy and the University of Virginia offered Bowditch chairs in mathematics. Bowditch again refused these offers, perhaps (in the case of the University of Virginia) because the $2,000 salary offered was two-thirds of the salary he received as president of the insurance company.
Bowditch's translation of the first four volumes of Laplace's Traité de mécanique céleste was completed by 1818. Publication of the work, however, was delayed for many years, most likely due to cost. Nonetheless, he continued to work on it with the assistance of Benjamin Peirce, adding commentaries that doubled its length.
By 1819, Bowditch's international reputation had grown to the extent that he was elected as a member of the Royal Societies of Edinburgh and London and the Royal Irish Academy.
In 1823, Bowditch left the Essex Fire and Marine Insurance Company to become an actuary for the Massachusetts Hospital Life Insurance Company in Boston. There he served as a "money manager" (an investment manager) for wealthy individuals who made their fortunes at sea, directing their wealth toward manufacturing. Towns such as Lowell prospered as a result.
Bowditch's move from Salem to Boston involved the transfer of over 2,500 books, 100 maps and charts and 29 volumes of his own manuscripts.
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