Magnetic actuation can either be used for actuating 1D or 2D MEMS mirrors. Two jointed chambering levers are pivoted from the actuating slide. Planetary roller screws are used as the actuating mechanism in many electro-mechanical linear actuators. On the actuating slide two pivoting, jointed chambering levers are mounted. The tank was steered by conventional tillers hydraulically actuating onto external brake discs. The intermediate shaft has an actuating member for each cylinder. Each cylinder bank had a single overhead cam actuating the poppet valves. The engine had single overhead camshaft per cylinder bank, actuating two valves per cylinder. The engine had a single overhead camshaft per cylinder bank, actuating two valves. In many older designs, kick-down is accomplished by mechanically actuating a valve inside the transmission. As well, a given amount of actuating force creates more pressure on the mating surfaces. There were five separate circuits actuating five different needles. The pistol may now be holstered, and can be fired without actuating any other controls. In most models, an auto actuating lens cover protects the lens from elements. This makes their direct acting use commonly limited to low actuating forces.