Air Core

Air core may refer to:

  • Air core drilling, a form of rotary air drilling
  • Magnetic core

Famous quotes containing the words air and/or core:

    “The animal merely makes a bed, which he warms with his body, in a sheltered place; but man, having discovered fire, boxes up some air in a spacious apartment, and warms that.... Thus he goes a step or two beyond instinct, and saves a little time for the fine arts.”
    —Henry David Thoreau (1817–1862)

    “In the core of God’s abysm,—
    Was a weed of self and schism;
    And ever the Daemonic Love
    Is the ancestor of wars,
    And the parent of remorse.”
    —Ralph Waldo Emerson (1803–1882)