sentences:  Joseph Henry Keenan
  
  Joseph Henry Keenan (August 24, 1900 – July 17, 1977) was an American thermodynamicist and mechanical engineer noted for his work in the calculation of steam tables, research in jet-rocket propulsion, and his work in furthering the development in the understanding of the laws of thermodynamics in the mid 20th century.His classic 1941 textbook "Thermodynamics" served as a fundamental teaching tool in various engineering curricula during the 1940s and 1950s.