1. Definitions.- For the purposes of this Schedule-
(a) “Grindstone” means a grindstone composed of natural or manufactured sandstone but does not include a metal wheel or cylinder into which blocks of natural or manufactured sandstone are fitted;
(b) “Abrasive wheel” means a wheel manufactured of blended emery or similar abrasive;
(c) “Grinding” means the abrasion, by aid of mechanical power, of metal by means of a grindstone or abrasive wheel;
(d) “Glazing” means the abrading, polishing or finishing, by aid of mechanical power of metal, by means of any wheel, buff, mop or similar appliance to which any abrading or polishing substance is attached or applied;
(e) “Racing” means the turning up, cutting or dressing of a revolving grindstone before it is brought into use for the first time;
(f) “Hacking” means the chipping of the surface of a grindstone by a hack or similar tool;
(g) “Rodding” means the dressing of the surface of a revolving grindstone by the application of rod, bar of metal to such surface.
2. Exception.- (1) Nothing in this Schedule shall apply to any factory in which only repairs are carried on except any part thereof in which one or more persons are wholly or mainly employed in the grinding or glazing of metals.
(2) Nothing in this Schedule except paragraph 4 shall apply to any grinding or glazing of metals carried on intermittently and at which no person is employed for more than 12 hours in any week.
(3) The Chief Inspector may be certificate in writing subject to such conditions as he may specify therein, relax or suspend any of the provisions of this Schedule in respect of any factory, if owing to the special methods of work or otherwise such relaxation or suspension is practicable without danger to the health or safety of the persons employed.
3. Equipment for removal of dust.- No racing, dry grinding or glazing shall be performed without-
(a) a hood or other appliance so constructed, arranged, placed and maintained as substantially to intercept the dust thrown off;
(b) a duct of adequate size, air-tight and so arranged as to be capable of carrying away the dust, which duct shall be kept free from obstruction and shall be provided with proper means of access for inspection and cleaning, and where practicable with a connection at the end remote from the fan to enable the Inspector to attach thereto any instrument necessary for ascertaining the pressure of air in the said duct:; and
(c) a fan or other efficient means of producing a draught sufficient to extract the dust:
Provided that the Chief Inspector may accept any other appliance that is in his opinion, as effectual for the interception, removal and disposal of dust thrown off as a hood, duct and fan would be.
4. Restriction on employment on grinding operations.- Not more than one person shall at a time perform the actual process of grinding or glazing upon a grindstone, abrasive wheel or glazing appliance:
Provided that this paragraph shall not prohibit the employment of persons to assist in the manipulation of heavy of bulky articles at any such grindstone, abrasive wheel or glazing appliance:
5. Glazing.- Glazing or other processes, except processes incidental to wet grinding upon a grindstone, shall not be carried on in any room in which wet grinding upon a grindstone is done.
6. Hacking and rodding.- Hacking or rodding shall not be done unless during the process either (a) an adequate supply of water is laid on at the upper surface of the grindstone, or (b) adequate appliances for the interception of dust are provided in accordance with the requirement of paragraph 3.
7. Examination of dust equipment.- (a) All equipment for the extraction or suppression of dust shall least once in every six months be examined and tested by a competent person, and any defect disclosed by such examination and test shall be rectified as soon as practicable.
(b) A register containing particulars of such examination and test shall be kept in a form approved by the Chief Inspector.