A cotton picker is either a machine that harvests cotton, or a person who picks ripe cotton fibre from the plants. The machine is also referred to as a cotton harvester. History In many societies, like America, slave and serf labor was utilized to pick the cotton, increasing the plantation owner's profit margins (See Trans-Atlantic Slave Trade). The first practical cotton picker was invented over a period of years beginning in the late 1920s by John Daniel Rust (1892–1954) with the later help of his brother Mack Rust. Other inventors had tried designs with a barbed spindle to twist cotton fibers onto the spindle and then pull the cotton from the boll, but these early designs were impractical because the spindle became clogged with cotton. Rust determined that a smooth, moist spindle could be used to strip the fibers from the boll without trapping them in the machinery. In 1933 John Rust received his first patent, and eventually, he and his brother owned forty-seven patents on cotton picking machinery. However, during the Great Depression it was difficult to obtain financing to develop their inventions. In 1935 the Rust brothers founded the Rust Cotton Picker Company in Memphis, Tennessee, and on 31 August 1936 demonstrated the Rust picker at the Delta Experiment Station in Stoneville, Mississippi. Although the first Rust picker was not without serious deficiencies, it did pick cotton and the demonstration attracted considerable national press coverage. Nevertheless, the Rusts' company did not have the capability of manufacturing cotton pickers in significant quantities. With the success of the Rust picker, other companies redoubled their efforts to produce practical pickers not based on the Rust patents. Then, widespread adoption was delayed by the manufacturing demands of World War II. The International Harvester Company produced a commercially successful commercial cotton picker in 1944. After World War II, the Allis-Chalmers Manufacturing Company manufactured cotton pickers using an improved Rust design. In the following years mechanical pickers were gradually improved and were increasingly adopted by farmers. The introduction of the cotton picker has been cited as a factor in the Second Great Migration. Cotton plant improvements To make mechanical cotton pickers more practical, improvements in the cotton plant and in cotton culture were also necessary. In earlier times, cotton fields had to be picked by hand three and four times each harvest season because the bolls matured at different rates. It was not practical