Amédée Mannheim (1831-1906)

In 1851, Amédée Mannheim, a young polytechnician (20 years old) at the Ecole d'artillerie et du génie de Metz, had the idea of changing the arrangement of the scales on the slide rule. This improvement, which increases accuracy and facilitates calculations, has remained the base of practically every rule since that time. He also indicates that a cursor will be useful but he did not invent it, contrary to what is often said. Mannheim publishes a very short (4 pages) booklet of instructions and gives Gravet the care to start the production of this type of rule that will become widespread. This is really the advent of the modern slide rule.
Mathematician, he will become a profesor at the École Polytechnique.