SCHEDULE IV Class Manufacture 1. Exemption.- If the Chief Inspector is satisfied in respect of any factory or any class of process that, owing to the special methods of work or the special conditions in a factory or otherwise any of the requirements of this Schedule can be suspended or relaxed without danger to the persons employed therein or that the application of this Schedule or any part thereof is for any reason impracticable, he may be certificate in writing authorise such suspension or relaxation as may be indicated in the certificate lor such period and on such conditions as he may think fit. 2. Definition.- For the purpose of this Schedule- (a) "Efficient exhaust draught" means, localised ventilation effected by mechanical means, for the removal of gas, vapour dust or fumes so as to prevent them (as far as practicable under the atmospheric conditions, usually prevailing) from escaping into the air of any place in which work is carried on. No draught shall be deemed efficient which fails to remove smoke generated at the point where such gas, vapour, fume or dust originate. (b) '1..ead compound" means any compound of lead other than galena which, when treated in the manner described below, yields to an aqueous solution of hydrochloric acid a quantity of soluble lead compound exceeding, when calculated as lead monoxide five per cent of the dry weight of the portion taken for analysis. The method of treatment shall be as follows :.- A weighted quantity of the material which has been dried at 100° and thoroughly mixed shall be continuously shaken for one hour a the common temperature with 1,000 times its weight of an aqueous solution of hydrochloric acid containing 0.25 per cent, by weight hydrogen chloride. This solution shall thereafter be allowed to stand for one hour and than filtered. The lead salt contained in the clear filtrate shall then be precipitated as lead sulphide and weighed as lead sulphate. (c) "Suspension" means suspension from employment in any process specified in paragraph 3 by written certificate in the Health Register Form No. 17 signed by the Certifying Surgeon who shall have power of suspension as regards all persons employed in any such process. 3. Exhaust draught.- The following processes shall not be carried on except under an efficient exhaust draught or under such other conditions as may be approved by the Chief Inspector :- (a) The mixing of raw materials to form a "batch "; (b) The dry grinding, glazing and polishing of glass or any article of glass; (c) All process in which hydrofluoric acid fumes or ammoniacal vapours are given off; (d) All process in the making of furnace moulds or "pots " including the grinding or crushing of used "pots"; (e) All processes involving the use of a dry lead compound. 4. Prohibition relating to women and young persons.- No women or young person shall be employed or permitted to work in any of the operations specified in paragraph 3 or at any place where such operations are carried on. 5. Floors and work-benches.- The floor and work-benches of every room in which a dry compound of lead is manipulated or in which any process is being carried on giving off silica dust shall be kept moist and shall comply with the following requirements- The floors shall be- (a) of cement or similar material so as to be smooth and impervious to water; (b) maintained in sound condition; and (c) cleansed daily after being thoroughly sprayed with water at a time when no other work is being carried on in the room. The work-benches shall- (a) have smooth surface and be maintained in sound condition; and (b) be cleansed daily either after being thoroughly damped or by meal of a suction cleaning apparatus at a time when no other work is being carried on throat. 6. Use of hydrofluoric acid.- The following provisions shall apply to rooms in which glass is treated with hydrofluoric acid- (a) There shall be inlets and outlets of adequate size so as to secure a maintain efficient ventilation in all parts of the room; (b) The floor shall be covered with gutia-percha and be tight and shall slope gently down to a covered drain; (c) The work places shall be so enclosed in projecting hoods that openings required for bringing in the objects to be treated shall be practicable; and (d) The efficient exhaust draught shall be so contrived that the gases a exhausted downwards. 7. Storage and transport of Hydrofluoric Acid.- Hydrofluoric acid Shall not be stored or transported except in cylinders or receptacles made of lead rubber. 8. Blow-pipes.- Every glass blower shall be provided with a separate blow pipe bearing the distinguishing mark of the person to whom it is issued and suitable facilities shall be readily available to every glass blower for sterilizing his blow-pipe. 9. Food, drinks etc. prohibited in work-rooms.- No food, drink, pan and supari or tobacco shall be brought into or consumed by any worker in any room or work-place wherein any process specified in paragraph 3 is carried on. 10. Protective clothing.- The occupier shall provide, maintain in go repair and keep in a clean condition for the use of all persons employed in the processes specified in paragraph 3 suitable protective clothing, foot-wear a goggles according to the nature of the work and such clothing footwear, etc., shall be worn by the persons concerned. 11. Washing facilities.- There shall be provided and maintained in a clean1y state and good repair for the use of all persons employed in the processes specified in paragraph 3. (a) a wash place with either- (i) a trough with a smooth impervious surface fitted with a waste pipe, without plug, and of sufficient length to allow of at least two feet for every five such persons employed at any one time and having a constant supply of water from taps or jets above the trough at intervals of not more than 2 feet; or (ii) at least one wash basin for every five such persons employed a anyone time, fitted with waste pipe and plug and having adequate supply of water laid on or always readily available; an (b) a sufficient supply of clean towels made of suitable material renewed daily with a sufficient supply of soap or other suitable cleansing material and of nail brushes; and (c) a sufficient number of stand pipes with taps-the number an location of such stand pipes shall be to the satisfaction of the Chie Inspector. 12. Medical Examination- (a) Every person employed in any process specified in paragraph 3 shall be examined by the Certifying Surgeon within seven days preceding or following the date of his first employment in such process an thereafter shall be examined by the Certifying Surgeon once in ever calendar month or at such other intervals as may be specified writing by the Chief Inspector on a day of which due notice shall be given to all concerned. (b) A Health Register in Form No.17 containing the names of all person employed in any process specified in paragraph 3 shall be kept. (c) No person after suspension shall be employed in any process specified in paragraph 3 without written sanction from the Certifying Surgeon entered in or attached to the Health Register. | 
