Measuring device suitable for linear distances
  Measuring device is proposed for determining a linear dimension. The device comprises three associated longitudinally moving parts one of which is a scale. The integer part of the device reading is being taken from the standard millimeter or inches scale, and The fine measurement (smaller than the minimum scale division) is being done by a setup of two sliders coupled to the device. The first slider includes measuring points. And the other slider includes measuring line. The decimal part of the reading is being taken in such a way that the measuring points reading is related to the fractions of the displacement between the graduated scale and the corresponding measuring line. 
Zaid A. I. Alsmadi, Ahmad B. B.Badry, Irfan A. Badruddin, T. M. Indra   Mahlia
physics.ins-det