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Frank Gilbreth’s wire models of factory worker movements (1915). 3D wire models of hand motion paths (or chronocyclegraphs) created by Frank Gilbreth, a pioneer in the study of motion in the workplace. In his 1917 book, Gilbreth explains how he created these solid models from time-lapse photographs, and how useful they are to study and teach human motion.http://dataphys.org/list/wire-models-of-factory-worker-movements/