英文說明:Two types of balances existed. One is the pan balance and the other the hook type balance. Both types had only one weight. The pan balance was used for items that could not be hung. Most general merchandise stores had such a balance for weighing loose goods. Most balance pans were made of copper and used copper weights. This example is a complete balance. The arm weight is present, but the string is missing. As a result, it cannot be used.