When place may be presumed to be common gaming house

If any instruments or appliances for gambling are found in any place entered under this Act, or upon any person found therein or escaping therefrom or if any police officer duly authorised under section 7 (1) of this Act is wilfully prevented from, or obstructed or delayed in, entering or approaching it or any part thereof, it shall be presumed, until the contrary is proved, that such place is a common gaming house, and that the place is so kept or used by the occupier thereof.