The drum is divided into loo graduations, each equal to 5.4'.
Fore-sights are made right and left; tangent sights are interchangeable, the graduations are cut on the horizontal edges above and below, so that the sight can be changed from right to left or vice versa by removing and reversing the bar.
Besides the main graduations there is usually a separate deflection scale " (Bethell).
The word passed through graduations of meaning.
For ordinary standards of length Guillaume's alloy (invar) of nickel (35.7%) and steel (64.3%) is used, as it is a metal that can be highly polished, and is capable of receiving fine graduations.