Leonardo Torres Quevedo Vannevar Bush floating-point arithmetic Electromechanical Arithmometer arithmetic Arithmometer IBM Analytical Engine
Two other inventors, Leonardo Torres Quevedo and Vannevar Bush, also did follow on research based on Babbage's work. In 1914, Torres published Essays on Automatics, where he wrote about Babbage's efforts at constructing a mechanical Analytical Engine and designed an electromechanical analytical machine which was to be controlled by a read-only program. The paper also introduced the idea of floating-point arithmetic. In 1920, he presented in a Paris conference the Electromechanical Arithmometer, an arithmetic unit that could perform operations automatically. Bush's paper Instrumental Analysis (1936) discussed using existing IBM punch card machines to implement Babbage's design. In the same year he started the Rapid Arithmetical Machine project to investigate the problems of constructing an electronic digital computer.
