Lever 1 is connected by turning pairs A, D and B to lever 8 for controlling reversible pump 2, to link 9 and to feedback link 7. Link 9 is connected by turning pair E to lever 10, turning about fixed axis F. Link 7 is connected by turning pair G to rudder stock 5 of the ship. Rod a of pistons 4 has pin b sliding in slot d of the stock. When point D is displaced to point D and, consequently, point A of control lever 1 of reversible pump 2 to point A', the pump delivers fluid to right-hand working cylinder 3. The fluid moves piston 4 to the left, turning rudder stock 5 about fixed axis C, until point B of feedback link 7 reaches point B'. At this, point A of pump control lever 1 is returned to its initial position at which pump 2 ceases to deliver fluid. If point D is displaced in the direction opposite to that mentioned above, fluid is delivered to left-hand cylinder 3 and the rudder stock is turned in the opposite direction. Relief valves 6 protect the working cylinders against excess pressure.
$4304$CHP,FD$