appreciate the two outer rows whether they are stator blades or rotor blades have substantially no relative motion between them i e both remain stationary or both rotate at the same velocity during operation whereas both of the outer rows have substantially the same relative motion in relation to the middle row i e both of the outer rows rotate while the middle row remains stationary or both of the outer rows remain stationary while the middle row rotates further as already described for clocking to be most effective between the two outer rows they each must be configured similarly as such the two outer rows of fig4 through 7 can be assumed to have substantially the same number of airfoils and the airfoils on each row can be assumed to be similarly sized and spaced around the circumference of each row for the sake of the examples in fig4 through 7 the first outer row of airfoils will be referred to as a first airfoil row 134 the middle row of airfoils will be referred to as a second airfoil row 136 and the other outer row of airfoils will be referred to as a third airfoil row 138 the relative motion of the first airfoil row 134 and the third airfoil row 138 is indicated by arrows 140 the flow direction which may represent the direction of flow through either the compressor 118 or the turbine 124 whatever the case may be is indicated by arrows 142 note that.