Abstract: A control apparatus for controlling a working arm of a machine, the arm including a plurality of relatively pivotal arm members, a first of the arm members, towards one end thereof, being pivotal, relative to a body of the machine about a first generally horizontal axis by actuator, and relative to the body of the machine about a generally upright axis by an actuator, and towards the other end of the first arm member, the first arm member being pivoted to the second arm member towards one end of the second arm member about a second generally horizontal axis with an actuator between the first and second arm members to effect relative pivoting, the control apparatus including a base, a first control link pivoted towards one end thereof to the base at a first joint which permits pivoting movement of the first link about a first generally horizontal axis, and pivoting movement relative to the base about a generally upright axis, and the first control link being pivoted towards a second end thereof to a second con