Section 10. Expenses of Members of the Convention.--Except for members of the General Assembly, officers and employes of the Commonwealth, the members of the constitutional convention shall each receive the total sum of twenty-five hundred dollars ($2500) for expenses in four equal installments, three of which shall be payable on December 15, 1967, January 15, February 15, 1968 and the fourth on the day when the convention adjourns finally. In addition, the members of the convention shall receive an allowance for travelling expenses of ten cents (10¢) per circular mile per week, computed on the same basis as travelling expenses for State Senators, payable monthly. The members of the General Assembly, officers and employes of the Commonwealth shall be reimbursed only for expenses actually incurred in attendance as delegates, unless the same are otherwise paid by the Commonwealth.