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a spherical aggregate of small diamond crystals used for drilling and for various industrial purposes.
Historical Examples

This cannot be distinguished from certain fragments obtained in the Neolithic cemetery at ballas.
El Kab J.E. Quibell

The crucial case at ballas was the secondary burial of a Libyan found in one of a group of stairway mastabas.
El Kab J.E. Quibell

These cists were found at ballas both in “stairway” tombs and in open Neolithic graves.
El Kab J.E. Quibell

A rough example of No. 44 was found at ballas, used anciently as a lamp with floating wick.
El Kab J.E. Quibell

The sides of one Neolithic tomb at ballas were lined with bars of this kind.
El Kab J.E. Quibell


Read Also:

  • Ballast

    Nautical. any heavy material carried temporarily or permanently in a vessel to provide desired draft and stability. Aeronautics. something heavy, as bags of sand, placed in the car of a balloon for control of altitude and, less often, of attitude, or placed in an aircraft to control the position of the center of gravity. anything […]

  • Ballast line

    the level to which a vessel is immersed when in ballast.

  • Ballast pocket

    a depression that is formed beneath the ballast layer by penetration of ballast particles into the subgrade and that tends to collect moisture.

  • Ballast resistor

    ballast (def 5a).

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