The Commissioners may from Time to Time make such reasonable Charge for the Use of such Baths, Bathing Places, Wash-houses, and Drying Grounds as they think fit, but as regards the Working Classes, mot exceeding the Charges if any, mentioned in the special Act, unless- for the Use of any Washing Tub or Trough for more than Two Hours in any One Day, in which Case any Charge may be made which the Commissioners deem reasonable;