Caliber rule
a gunner's calipers, an instrument having two scales arranged to determine a ball's weight from its diameter, and conversely. |
See also: Caliber
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
a gunner's calipers, an instrument having two scales arranged to determine a ball's weight from its diameter, and conversely. |
See also: Caliber