Cotton gin

Eli Whitney develops a gin for short-staple cotton

Whitney said he had a rough model within about ten days. Copies of the machine were running in Georgia before any patent reached him.

Mulberry Grove, 1793

Staying at Catharine Littlefield Greene's Mulberry Grove plantation near Savannah, Georgia, in 1793, Eli Whitney turned his attention to the difficulty of removing seeds from short-staple green-seed cotton, and developed a working gin.

Georgia planters could grow that cotton inland, but its tightly adhering seeds were too slow and costly to strip by hand — several hours of one worker's labour to clean a single pound. Whitney later wrote that he built a small, imperfect model within about ten days of conceiving his plan, and finished a larger machine in April.

A partnership in May, a petition in June

On 27 May, Whitney and Phineas Miller signed a partnership agreement to finance, patent and commercialise the machine.

Whitney submitted a patent petition to Secretary of State Thomas Jefferson on 20 June, and notarised his detailed description and inventor's oath on 28 October. One gin could turn out up to 50 pounds of cleaned cotton in a day.

Copied before it was protected

Before a patent was issued, copies and altered versions of the machine were already being constructed and operated in Georgia. Knowledge of the simple mechanism spread that quickly.

What Whitney made was a design effective on short-staple cotton, an improvement within a centuries-old class of machines rather than the first gin of any kind — and it cleaned cotton after harvest, it did not pick it. The surviving federal patent materials name Whitney; possible contributions by Catharine Greene and by enslaved workers are debated and poorly documented.

Sources

Researched 23 Aug 2026 5 sources 2 audit passes

How this was checked

Researched from the web into a fact sheet, rewritten from that sheet, then audited against it by a different model. How the pipeline works →

What the sources leave uncertain

The sources firmly support 1793, but no single securely documented “invention day” survives.
Whitney’s specific short-staple design was an improvement in a centuries-old class of machines, not the first cotton gin of any kind.
Possible contributions by Catharine Greene and enslaved workers are debated and poorly documented; the surviving federal patent materials name Whitney.