Persian Drill

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:

    The threadbare trees, so poor and thin,
    They are no wealthier than I;
    But with as brave a core within
    They rear their boughs to the October sky.
    Poor knights they are which bravely wait
    The charge of Winter’s cavalry,
    Keeping a simple Roman state,
    Discumbered of their Persian luxury.
    Henry David Thoreau (1817–1862)

    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)