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Article 3 The continued employment at sea of any such child or young person shall be subject to the repetition of such medical examination at intervals of not more than one year, and the production, after each such examination, of a further medical certificate attesting fitness for such work. Should a medical certificate expire in the course of a voyage, it shall remain in force until the end of the said voyage. Article 4 In urgent cases the competent authority may allow a young person below the age of eighteen years to embark without having undergone the examination provided for in Articles 2 and 3 of this Convention, always provided that such an examination shall be undergone at the first port at which the vessel calls. Night Work of Young Persons (Industry) Convention, 1919 Article 1 1. For the purpose of this Convention, the term " industrial undertaking " includes particularly—(a) Mines, quarries, and other works for the extraction of minerals from the earth : (b) Industries in which articles are manufactured, altered, cleaned, repaired, ornamented finished, adapted for sale, broken up, or demolished, or in which materials are transformed; including shipbuilding, and the generation, transformation, and transmission of electricity or motive power of any kind: (c) Construction, reconstruction, maintenance, repair, alteration, or demolition of any building, railway, tramway, harbour, dock, pier, canal, inland waterway, road, tunnel, bridge, viaduct, sewer, drain, well, telegraphic or telephonic installation, electrical undertaking, gaswork, waterwork, or other work of construction, as well as the preparation for or laying the foundations of any such work or structure: (d) Transport of passengers or goods by road or rail, including the handling of goods at docks, quays, wharves, and warehouses, but excluding transport by hand. 2. The competent authority in each country shall define the fine of division which separates industry from commerce and agriculture. Article 2 1. Young persons under eighteen years of age shall not be employed during the night in any public or private industrial undertaking, or in any branch thereof, other than an undertaking in which only members of the same family are employed, except as hereinafter provided for. 2. Young persons over the age of sixteen may be employed during the night in the following industrial undertakings on work which, by reason of the nature of the process, is required to be carried on continuously day and night—(а) Manufacture of iron and steel; processes in which reverberatory or regenerative furnaces are used, and galvanizing of sheet metal or wire (except the pickling process) : (б) Glass-works : (c) Manufacture of paper : (d) Manufacture of raw sugar : (e) Gold-mining-reduction work. Article 3 1. For the purpose of this Convention, the term " night" signifies a period of at least eleven consecutive hours, including the interval between ten o'clock in the evening and five o'clock in the morning. 2. In coal and lignite mines work may be carried on in the interval between ten o'clock in the evening and five o'clock in the morning, if an interval of ordinarily fifteen hours, and in no case of less than thirteen hours, separates two periods of work, 3. Where night work in the baking industry is prohibited for all workers, the interval between nine o'clock in the evening and four o'clock in the morning may be substituted in the baking industry for the interval between ten o'clock in the evening and five o'clock in the morning. 4. In those tropical countries in which work is suspended during the middle of the day, the night period may be shorter than eleven hours if compensatory rest is accorded during the day. Article 4 The provisions of Articles 2 and 3 shall not apply to the night work of young persons between the ages of sixteen and eighteen years in case of emergencies which could not have been controlled or foreseen, which are not of a periodical character, and which interfere with the normal working of the industrial undertaking.

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