Factories. [Ch. 30. No. 2. work of engineering construction means the ‘onstruction of any railway line or siding, and the construction, structural alteration or repair (including re-pointing and re-painting) or the demolition of any dock, harbour, inland navigation, tunnel, bridge, viaduct, waterworks, reservoir, pipe-line, aqueduct, sewer, sewage works, gasholder, oil tank, road, trace or footpath ; “young person means a person who has attained the age of fourteen and has not attained the age of eighteen years. (2) For the purposes of this Ordinance, machinery or plant shall be deemed to have been constructed or re-constructed before the passing of this Ordinance or the making of regulations or orders under this Ordinance, and a factory or building shall be deemed to have been con- structed, re-constructed, extended, added to, or converted for use as a factory, before the passing or commencement of this Ordinance or the coming into operation of any provision of this Ordinance, if the construction, re- construction, extension, addition, or conversion was begun before the passing or commencement of this Ordinance, or the making of regulations or orders under this Ordinance, or the coming into operation of any provision of this Ordinance, as the case may be. (3) For the purposes of this Ordinance, a factory shall not be deemed to be a factory in which mechanical power is used by reason only that mechanical power is used for the purpose of ventilating or lighting the work- rooms or other parts of the factory. (4) A woman, young person, or child who works in a factory, whether for wages or not, either in a process or in cleaning any part of the factory used for any process, or in cleaning or oiling any part of the machinery or plant, or in any other kind of work whatsoever incidental to or connected with the process, or connected with the article made or otherwise the subject of the process therein, shall, save as is otherwise provided by this Ordinance or any regulations or orders made thereunder, be deemed to be employed therein for the purposes of this Ordinance or of any proceedings thereunder: Provided that any woman 119