PART XII PLATFORM WEIGHING MACHINES AND WEIGHBRIDGES

Materials and principles of construction
114 In the case of small portable platform weighing machines for use in the weighing of coal and commonly known as bob-up weighing machines, the counterpoises shall not be threaded on to a pin rigidly attached to one end of the main lever, but shall either be used in a tray or pan suspended from a knife-edge bearing or be placed on a loose shackle.