Gantt chart
The concept of a progress bar was invented before digital computing. In 1896 Karol Adamiecki developed a chart named a "harmonogram", but better known today as a Gantt chart. Adamiecki did not publish his chart until 1931, however, and then only in Polish. The chart thus now bears the name of Henry Gantt (1861–1919), who designed his chart around the years 1910–1915 and popularized it in the west.