Correction to the definition of the imbalance mass required to correct a disk skew as reported on page 459. The equation was stated correctly, the explanation of the term $Uoz$ was in error.
$Uoz=2δsWD2DsδwDw$
where,

• $δs$

= runout from dial indicator, in. $1in.=2.54cm$

•
• $δw$

= axial separation of balance weights, symmetric to disk centerline, in. $1in.=2.54cm$

•
• $Uoz$

= couple unbalance mass required to counteract or to simulate a skew, $oz$$1oz=28.35g$

•
• $D$

= diameter of disk, in. $1in.=2.54cm$

•
• $Ds$

= diameter where skew was measured, in. $1in.=2.54cm$

•
• $Dw$

= diameter of balance weight circle, in. $1in.=2.54cm$

•
• $W$

= disk weight, $lbf.1lbf=4.45N$