The duties of the commission, authorized to be created by the act to which this act is a supplement and which are in said act prescribed, are hereby continued, and the said commission is further authorized, when the line shall be finally settled, to place such stone monuments on the same and at such distances apart, not to exceed one monument to each mile, as the commissioners may deem necessary, and the commission and its successors, who shall be appointed by the governor should death, resignation or other cause change the personal organization of the same, shall make report and account of all expenditures, as required in the act to which this act is a supplement: Provided, That the states of Ohio and West Virginia shall authorize the creation of or the continuance of the commission or commissioners, which on the part of the said state have acted or may act in conjunction with the commission provided for by this commonwealth in the act to which this act is a supplement, so that the ascertainment of the true location, the renewal and placing of the monuments shall be sustained by the joint authority of the two states bordering each other, and the said two states so bordering each other shall bear equally all reasonable expenditure in actual survey of the line or lines; and the compensation of said commissioners shall be six dollars per day, for each and every day necessarily employed in the discharge of said duties hereinbefore defined by the act to which this act is a supplement.