Scales, ContinuedDivisionScales are either engine divided or stenciled/painted. Engine division ishighly accurate and etched into the scale face. Stenciled or paintedincrements are less accurate and easily worn away.Division styleA DM must know four terms relating to the way in which increments aredisplayed on a scale that a DM must know. These are open divided, fullydivided, double numbered, and single numbered.OPEN DIVIDED: On an open divided scale, only the main increments areshown. There is one fully subdivided increment on the end of the scale tothe left of the 0 point, Measurements of full units are read from the right ofthe 0, while partial increments are left of the 0.FULLY DIVIDED: All increments on a fully divided scale are shown. Thismakes it easier to use, but not easier to read.DOUBLE NUMBERED: The convenience of a double-numbered scale arethat it reads from left to right and from right to left, allowing two differentscales to appear on the same scale face.SINGLE NUMBERED: This is by far the easiest scale division to readbecause there is only one scale per face, and it is usually fully divided.Continued on next page2-50
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