57.-(1) Where in any room lead, arsenic or other poisonous substance is so used as to give rise to any dust or fume, a person shall not be permitted to partake of food or drink in that room or to remain in that room during the intervals allowed to him for meals or rest other than intervals allowed in the course of a spell of continuous employment.
(2) Where in any room a process is carried on being a process which gives rise to siliceous dust or asbestos dust, a person shall not be permitted to remain in that room during the intervals allowed to him for meals or rest other than intervals allowed in the course of a spell of continuous employment.
(3) Suitable provision shall be made for enabling the persons employed in any such room as is mentioned in the last two foregoing subsections to take their meals elsewhere in the factory.
(4) Where it appears to the Yπουργός that, by reason of the nature of any process, it is injurious to health or otherwise undesirable to take meals in rooms where that process is carried on, or to remain therein during the intervals allowed for meals or rest, he may, if he thinks fit, extend all or any of the provisions of subsections (1) and (2) of this section to rooms where that process is carried on.