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Two measures are used by jewelers to determine this — karat and pennyweight.

You shall stand on your conditions now; you shall have your pennyweight and full advantage, and the rigour of the pact.

Scarce a pennyweight of honest horseflesh to be seen.

The author of The Field Book says: "That an arrow weighing from twenty to four-and-twenty pennyweights, made of yew, was considered by archers the best that could be used."

It is not to be expected that metallurgical results of this period will "tie up" with the exactness of the modern operator's, and it has not been considered necessary to calculate beyond the nearest pennyweight.