A flat wooden piece marked in cm. and mm.

Rules of measurement

1. The diameter should be measured along the passing through pith. In case of eccentric stumps or logs, two diameters, one along major axis and other at right angles to it should be measured
2. As the end of the scale gets worn off by continuous use, the measurement should be taken from first centimeter & not from zero and deduct one cm from the reading
3. The scale should be placed on edge so that the ends of the line to be measured coincide with marks of the scale
4. While reading measurement, the eye should be just above the mark, If this is not done, some error will creep in the measurement & this is called error of parallax.

Uses

• To measure diameter of stumps or end sections of logs exposed as a result of cross-cutting.
• Stump and stem analysis for measuring radius at successive decade marks.

Two types

1. 30 cm long and 3 cm width
2. 60 cm long and 1.5 cm width

Folding arrangement at every 15 cm length, first folded at 30 cm

Techniques of measurement

• Two diameters: one along major axis and other at rt. angle to it.
• Take measurement from first cm., not from the zero
• Eye should be just above the mark