There he saw the laborious process of hand-separating seeds from the fibers of short-staple cotton, a crop prevalent throughout much of the South. With Greene’s support, Whitney developed his cotton gin that used wire teeth to pull cotton fibers through a mesh screen that was too fine for seeds to pass. A rotating brush then removed the cleaned fibers.
Various forms of cotton gins had existed for centuries, but Whitney’s design efficiently processed short-staple cotton on a commercial scale. While workers could clean roughly one pound of cotton per day by hand, Whitney’s machine could clean as much as 50 times that amount. As a result, production of American raw cotton expanded dramatically, roughly doubling each decade after 1800 and becoming the nation’s leading export. By mid-century, the U.S. was producing nearly three-fourths of the world’s cotton supply.
Although the cotton gin reduced the labor required to clean cotton, it increased the demand for enslaved labor to plant and harvest the crop. Cotton planters profited enormously, but Whitney earned relatively little from his invention due to widespread patent infringement and prolonged legal battles.
In 1798, four years after receiving his cotton gin patent, Whitney secured a U.S. government contract to manufacture 10,000 muskets within two years. Although it ultimately took him about a decade to fulfill the order, Whitney helped popularize the use of standardized, interchangeable parts in American manufacturing. His methods, allowing for faster assembly and easier repairs than firearms crafted individually by master gunsmiths, helped propel the Industrial Revolution.
