What is a Whetstone? How does one compute them?

[Randolph J. Herber]

..

I need the definitions of a Whetstone and the process used to
compute the measure on a machine.

	Randolph J. Herber, Amdahl Systems Engineer,
	..!ihnp4!ihuxj!rjh,
	c/o IH 1C220, AT&T Bell Labs, Naperville, IL 60566,
	    (312) 979-6554 or AT&T Cornet 8-367-6554,
	 or Amdahl Corp., Suite 250, 6400 Shafer, Rosemont, IL 60018,
	    (312) 692-7520