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| The Encyclopedia of World History. 2001. |
| 1889 | |
| Angus Campbell tested the first spindle-type cotton picker; this type of machine was not fully developed and marketed successfully until the 1940s, competing with the machine devised by John and Mack Rust in 1924 and also commercially produced in the 1940s. | 1 |
| 1892 | |
| Gasoline tractor came into use for farming. Caterpillar tractor developed 1931. | 2 |
| 1902 | |
| W. Normann patented a process for hardening liquid fats by hydrogenation, making available an ample supply of solid fats for soap and food. | 3 |
| The Encyclopedia of World History, Sixth edition. Peter N. Stearns, general editor. Copyright © 2001 by Houghton Mifflin Company. Maps by Mary Reilly, copyright © 2001 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. | |
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