For testing the aggregates for resistance to abrasion in accordance with the standard peocedure laid down in BS : 812. The apparatus consists of a metal disc which revolves in a horizontal plane on a vertical shaft. A suitable attachment for holding the specimen with its axis vertical and its lower end pressed with a prescribed pressure against the surface of the disc (the distance from the centre of specimen to the centre of shaft being 25 cm) is provided. A convenient funnel for feeding sand continuosly upon the rotating disc is also provided. The machine is fitted with a 1/4 h.p. electric motor, driven through a reduction gear to 28-30 revolutions of the disc per minute. Suitable for operation from 220/230 volts, single phase, A.C.supply.