They may prescribe the manner of constructing stone, brick and other buildings, and the construction and maintenance of fire escapes; may cause all buildings used for public purposes to be provided with sufficient and ample means of exit and entrance, and to be supplied with necessary and appropriate appliances for the extinguishment of fire; may prevent the overcrowding thereof, and regulate the placing and use of seats, scenery, curtains, blinds, screens, or other appliances therein.