Q : What is diagonal scale ?
A :Diagonal scale a scale which consists of a set of parallel lines, with other lines crossing them obliquely, so that their intersections furnish smaller subdivisions of the unit of measure than could be conveniently marked on a plain scale.
Diagonal scale a scale for laying down small fractions of the unit of measurement, the parallel lines drawn lengthwise on its surface being divided into sections by lines drawn crosswise, and in one end section being intersected by a series of other parallel lines drawn obliquely at equal distances across them
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~ mr improver