Carl Georg Barth
Carl Georg Lange Barth (February 28, 1860 – October 28, 1939) was a Norwegian-American mathematician and mechanical engineer who improved and popularized the industrial use of compound slide rules in scientific management. 
Carl Georg Barth was born in Christiania, Norway. He was the fourth child of Jakob Boeckman Barth (1822-1892), a lawyer and Adelaide Magdeline Lange Barth (1828- 1897), daughter of a Danish clergyman. He received his early education in the public schools at Lillehammer. He was a graduate from University at Christiania. He later attended the Royal Norwegian Navy technical school at Horten. In 1877, Barth started an apprenticeship in the navy yard at Karljohansvern in Horten.
In 1899, efficiency expert Frederick W. Taylor hired Barth to work with him at Bethlehem Steel Company. Carl Barth helped to develop speed-and-feed-calculating slide rules. In 1902, Taylor and Barth went to work for William Sellers at the machine tool firm of William Sellers & Company of Philadelphia. An account of their application of slide rules was published in the Transactions of the American Society of Mechanical Engineers in 1904.
Barth started in 1905 on his independent career as consulting engineer. Barth became an early consultant on scientific management and later taught at Harvard University. Barth edited articles submitted to International Correspondence School of Scranton, Pennsylvania publication, the Home Study Magazine. In 1909, he undertook the installation of scientific management in the Watertown Arsenal at Watertown, Massachusetts.
- US Patent 753,840, 1904
- Carl G. Barth, 1860–1939: A Sketch (Florence M. Manning. Norwegian-American Historical Association. Volume XIII: Page 114 
- Frederick Winslow Taylor, Class of 1883 (Stevens Institute of Technology) 
- An Interpretive Review of 20th US Machining and Grinding Research (M. Eugene Merchant. Cincinnati, Ohio: Techsolve, Inc. 2003)
- Taylorism at the Watertown Arsenal (Foundations and Trends in Technology) 
- Drucker, P. F. (1993). The Rise of the Knowledge Society. The Wilson Quarterly (1976-), 17(2), 52–71. doi:10.2307/40258682
- Bjork, Kenneth Saga In Steel And Concrete – Norwegian Engineers In America (Northfield, Minnesota: Norwegian-American Historical Association, 1947)
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