Before revision: The scale was introduced in 1812 by the German geologist and mineralogist Friedrich Mohs, in his book "Versuch einer Elementar-Methode zur naturhistorischen Bestimmung und Erkennung der Fossilien" ; it is one of several definitions of hardness in materials science, some of which are more quantitative.
After revision: The scale was introduced in 1812 by the German geologist and mineralogist Friedrich Mohs, in his book ; it is one of several definitions of hardness in materials science, some of which are more quantitative.