(a)In every factory in which more than 250 persons are employed on the processes to which these rules apply there shall be provided and maintained in good order an ambulance room. The ambulance room shall be a separate room used only for the purpose of treatment and rest. It shall have a floor space of not less than 100 square feet, and smooth, hard and impervious walls and floor and shall be provided with ample means of natural and artificial lighting. It shall contain all the items shown in Schedule IV. Where persons of both sexes are employed, arrangements shall be made at the ambulance room for their separate treatment.