It is an instrument for the measurement of small length e.g. the diameter of Newtons rings, narrow tubes etc. It consists of a compound microscope mounted vertically or horizontally on a right metal frame so that it can be moved in a direction at right angles to its axis by means of a screw.

The displacement of microscope is measured with verniers which moves with the microscope along a scale fixed to the instrument.

Specification

• Base : Properly painted heavy cast iron base, with two leveling screws. Top surface is machined for smooth sliding of carriage having clamping screws for locking.

• Horizontal Scale : The horizontal scale fitted on the bed in machine divided on a life time stainless steel to a length of 14cm graduated in 0.5mm division.

• Vertical Scale : The vertical scale fitted on the vertical pillar is also machine divided on a life time stainless steel to a length of 14cm in 0.5mm division.

• Verniers : Horizontal and Vertical verniers, both have divided in 50 divisions such that 50 vernier scale division coincides with 49 mains scale division.