the quantity of reinforcement to be measured under this section shall the computed weight in three places after the decimal point in tons of material used and accepted as shown on the Drawings provided that the quantity shall not include the Reinforcement in any item of work for which the basis of payment includes the reinforcement. In computing the weight to be measured, the theoretical weights of bars of the cross section shown on the Drawings or authorized, shall be used. These weights are give in the following tables.