Definition of "nonius" [no•ni•us]

• A device for adjusting the accuracy of mathematical instruments, later superseded by the vernier (noun)

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• "Rigid props are differentiated from yielding props according to the operating principle: rigid props, for example threaded and nonius-props, can only react to increased compressive loads when a wooden bar permits deformation, otherwise they collapse when the maximum load is exceeded."
• "Fig.: Nonius-prop, in which the nonius serves to increase the setting load of the otherwise rigid prop. Source:"
• "The nonius, never in common use, consisted essentially of forty-six concentric circles divided into quadrants by two diameters at right angles to each other, each quadrantal arc being divided into equal parts, the number of parts diminishing from ninety for the outermost arc to forty-five for the innermost."