Heavy cast Iron base 45×15×2.5cm thick hinged to wood. Plane comprising two wood strips 47.5×6.2×2cm thick, 2 cm apart, rigidly jointed at ends by metal cross pieces. One strip with 5 cm extension carrying a clamp for holding pulley at any angle. Aluminum pulley 4.5cm in diameter on stem 15cm long.The angle can be read in degrees and the hypotense and vertical height of the force triangle can be read in cm directly from the scale on the sides. The plane can be inclined up to 45 degrees. Supplied with iron roller and S.S. scale pan.