Pennyweight
a Troy weight, containing 24 grains, each grain being equal to a grain of wheat from the middle of of the ear, well dried. Twenty pennyweights make one ounce Troy weight. The name is derived from its having been originally the weight of the silver penny. mark that it could be broken into halves. the form of a warm infusion, to promote (thence called half-penny) or quarters (fourthings or farthings). Its weight was steadily decreased till at last, in the reign of Elizabeth, it was fixed at 7 grains, or the 62d part of an ounce of silver. Copper pennies were first coined in 1797, but copper half-pennies and farthings had been in use from 1672.
The old Scotch penny was only a 12th of a penny sterling in value, the pound being equal to 20 pennies sterling.
In the United States the term penny is commonly used for "cent," the 100th part of a dollar. It consists of 95 per cent. of copper and 5 per cent. tin and zinc.
There are 1,000,000,000 pennies in circulation throughout the country and the Philadelphia mint is turning them out at