Harrison Enterprises

The apparatus has a stable iron base 45x15 cm hinged to wooden strips 48x6cm separated by about 2cm rigidly jointed at ends by metal cross pieces on the upper surface which serve at stops for the carriage, Aluminum pulley 5cm diameter well balanced, is attached to a clamp passing through an extension of one side of the plane The pulley is adjustable at any angle and is inline with the centre of the gap divided the parts of the plane. A San Aluminium centimeter scale is fixed to the edge of the plane and a combined. Angular and liner scale is screwed to the base with a positive clamp. This also serves as an index