was already friendly with James Hartness, the president of the Jones & Lamson Machine Company (J&L), another company in town. In 1911, Flanders married Hartness' daughter, Helen. Shortly afterwards, Hartness hired Flanders as a manager of the department at J&L that built the Fay automatic lathe. Flanders redesigned that lathe to achieve higher productivity and accuracy. He became a director in 1912 and president of the company in 1933 after Hartness retired. As president of J&L, Flanders implemented a continuous production line to manufacture the Hartness Turret Lathe instead of building each machine individually, attempting to bring some of the efficiencies of mass production to machine tool building. By 1923, he had acquired and assigned more than twenty patents to J&L. Flanders and his brother, Ernest, were instrumental in developing screw thread grinding machines. These incorporated advances in thread technology (furthered by the Hartness optical comparator) and Flanders's engineering calculations for gear-cutting machinery. In 1942, the two brothers received the Edward Longstreth Medal of the Franklin Institute as recognition of this accomplishment, which improved the accurate manufacture of die-cut screws in soft metal and solved the problem of thread-grinding on hardened work. The award also recognized their development of a precision grinding machine that enabled rapid production of turbine blades at the start of jet aircraft age, which made it possible for companies including General Electric to manufacture jet engines far more quickly than they could previously. Professional societies Flanders became president of the National Machine-Tool Builders Association in 1923. He served as president of the American Society of Mechanical Engineers (ASME) from 1934 to 1936. He was vice president of the American Engineering Council in 1937. Throughout the 1930s, Flanders served as chairman of the Screw-Thread Committee of the American Standards Association. In 1944 the ASME awarded him the Hoover Medal for his "public service in the field of social, civic and humanitarian effort[s]". The British Institution of Mechanical Engineers made him an honorary member. Public life In 1917, Flanders served in the Machine-Tool Section of the War Industries Board. After World War I, he oversaw the completion of international standards for screw threads through the 1930s, first as a member, then as chairman of the Screw-Thread Committee of the American Standards Association. During the Great Depression Flanders began to write about social policy. His major concern was human development in a technological era. He addressed employing spiritual guidance