an auxiliary sliding scale used to more easily read the values on a fixed main scale
a small, moveable scale placed next to the main scale of
A short scale made to slide along the divisions of a graduated instrument for indicating parts of divisions, to obtain very fine adjustments.
A small, movable auxiliary graduated scale attached parallel to a main graduated scale, calibrated to indicate fractional parts of the subdivisions of the larger scale, and used on certain precision instruments to increase accuracy in measurement; an auxiliary device designed to facilitate fine adjustments or measurements on precision instruments.
a scale used to obtain a precise reading of an instrument, particularly for mariners, of the altitude readings on a sextant.
A short, sliding scale attached to the main scale on some instruments and barometers in the 19th and 20th centuries to make minute readings possible. The scale was invented 1631 by French mathematician Paul Vernier.
