An Act amending the act of May 16, 1921 (P. L. 579, No. 262), entitled, as amended, "An act providing for the better management of the jails or county prisons in the several counties of this Commonwealth of the third, fourth, fifth classes and in certain counties of the sixth class by creating, in such counties, a board to be known by the name and style of inspectors of the jail or county prison, with authority to appoint a warden of such prison, and by vesting in said board, and the officers appointed by it, the safe-keeping, discipline, and employment of prisoners and the government and management of said jails or county prisons," changing the composition of the board of prison inspectors and authorizing counties of the seventh and eighth class to be governed by this act.