the sleeve 14 from the spring 17 starting from an equilibrium condition in which the engine is operating at a desired alternator speed in this case 50 hz in the event that the load on the engine falls then the engine operating speed will increase and as a result the weights will tend to pivot outwardly towards the position shown in fig1 due to an increase in the magnitude of the centrifugal force experienced by the weights the movement of the weights results in the toes 13 of the weights 12 pushing the sleeve 14 and lever 15 against the action of the spring 17 the movement of the lever 15 is transmitted through the coupling 19 adjusting the setting of the metering valve 21 to reduce the rate at which fuel is supplied to the pump and hence to reduce the rate of fuel supply to the engine compensating for the reduction in the load on the engine similarly starting from the equilibrium condition in the event that the load on the engine increases then the speed of operation of the engine and hence the speed of the shaft 11 falls the spring 17 is thus able to move the lever 15 and sleeve 14 to move the weights 12 towards a radially inner position against the action of a reduced centrifugal force experienced by the weights 12 the movement of the lever 15 is transmitted to the metering valve 21 to increase the rate of fuel supply to the pump and engine to compensate for the increased load on the engine in the event that the alternator speed when the governor occupies.