No boy or girl over fourteen (14) years of age and under sixteen (16) years shall be permitted to work in any mill, cannery, workshop, factory, or manufacturing establishment more than eight (8) hours in one (1) day, or more than forty-four (44) hours in any one (1) week, or be employed in or detained in any such establishment between the hours of 7 p.m. and 6 a.m.