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:
“Without [diversion] we would be in a state of weariness, and this weariness would spur us on to seek a more solid means of escaping from it. But diversion amuses us, and leads us unconsciously to death.”
—Blaise Pascal (1623–1662)
“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)