A spur rack has a planar pitch surface and straight teeth that are at right angles to the direction of motion.
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Famous quotes containing the words spur and/or rack:
“How all occasions do inform against me,
And spur my dull revenge!”
—William Shakespeare (1564–1616)
“What we have we prize not to the worth
Whiles we enjoy it, but being lacked and lost,
Why, then we rack the value, then we find
The virtue that possession would not show us
Whiles it was ours.”
—William Shakespeare (1564–1616)