Improved Cathetometer L Shaped :- It can be used horizontally or vertically and is provided with heavy leveling screws. The square bar of gun metal is graduated in half degrees and is read by vernier, Vernier constant is 0.01 or 0.02 mm as desired. The brass rod rotates on center and can be clamped at any desired place The carriage of the telescope is of gunmetal and further provided for giving final adjustment to the telescope. Focussing is provided by rack and pinion.