This is an economical form of inclined plane consisting of 60×10cm board either with glass top or sunmica top, hinged to the base board of size 45×10cm. The pulley is attached to one end of the upper board. The upper board (plane) can be set at any angle by clamping the wing nut. Complete with graduated aluminum arc and iron N.P. Roller. Supplied with wooden carriages of 10x10cm with look for determine the force of friction.