Captain Henry Metcalfe (October 29, 1847 – August 17, 1927) was an officer in the United States Army Ordnance Corps, inventor and early organizational theorist, known for his 1873 invention of a detachable magazine for small arms,[1] for his work on modern management accounting,[2][3] the development of the "time card" and his theory on the role of middle management.[4]
^United States. War Department (1873) Annual Report of the Secretary of War. Volume 3, page 91