178 Ch. 30. No. 2.] Factories, Special provisions as to evidence. Service and sending of documents, ete. 81. (1) If a person is found in a factory at any time at which work is going on or the machinery is in motion, except during the intervals for meals or rest, he shall, until the contrary is proved, be deemed for the purposes of this Ordinance to have been then employed in the factory: Provided that this subsection shall not apply to a factory in which the only persons employed are members of the same family dwelling there. (2) Where in any proceedings under this Ordinance with respect to a young person it appears to the court that that young person is apparently of or below the age alleged by the informant, it shall lie on the defendant to prove that the young person is not of or below that age. (3) Where any entry is_ required by this Ordinance or by any regulations or orders made thereunder to be made in the general register or m any other register or record, the entry made by the occupier of a factory or on his behalf shall, as against him, be admissible as evidence of the facts therein stated, and the fact that any entrv so required with respect to the observance of any provision of this Ordinance or of any regulations or orders made thereunder has not been made, shall be admissible as evidence that that provision has not been observed. 82. (1) Any document (including any summons or order) required or authorised to be served under this Ordinance may be served (a) on any person by delivering it to him, or by leaving it at, or sending it by registered post to, his residence (6) on any firm by delivering it to any partner of the firm, or leaving it at, or sending it by registered post to, the office of the firm, (c) on the owner or occupier of a factory (including any such owner or occupier being a company to which the Companies Ordinance applies), in any such manner as aforesaid, or by delivering it, or a true copy thereof, to any person in a position of responsibility at the factory (2) Any such document may be addressed for the purpose of the service thereof on the occupier of a factory,