In cities of the first class all money being the proceeds of loans heretofore or hereafter issued by such cities shall constitute a fund to be called the "consolidated loan fund;" from which consolidated fund it shall be lawful to appropriate and use money for any purpose for which any loan or loans may have been authorized or issued by such cities: Provided, however, That nothing in this act shall permit the appropriation or use of money, for any purpose, in excess of the amount authorized or borrowed for that purpose.
53 P.S. § 15782