A Persian drill is a drill which is turned by pushing a nut back and forth along a spirally grooved drill holder. It was formerly used for delicate operations such as jewellery making and dentistry. A ratcheting screwdriver with a 'spiral ratchet' mechanism may be used as a Persian drill.
Famous quotes containing the words persian and/or drill:
“Oh! thou clear spirit of clear fire, whom on these seas I as Persian once did worship, till in the sacramental act so burned by thee, that to this hour I bear the scar; I now know thee, thou clear spirit, and I now know that thy right worship is defiance. To neither love nor reverence wilt thou be kind; and e’en for hate thou canst but kill; and all are killed. No fearless fool now fronts thee.”
—Herman Melville (1819–1891)
“Swift blazing flag of the regiment,
Eagle with crest of red and gold,
These men were born to drill and die.
Point for them the virtue of slaughter,
Make plain to them the excellence of killing
And a field where a thousand corpses lie.”
—Stephen Crane (1871–1900)