To), for the purpose of interposing at pleasure the prism it in the axis of the reading micrometer; this enables the observer to view the graduations on the face of the metallic thermometer TT (composed of a rod of brass and a rod of zinc).
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 drum is divided into loo graduations, each equal to 5.4'.
The word passed through graduations of meaning.
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