The presence of electric bells, wires or signals or dumbwaiters or of other implements or appliances that may be used for the purpose of communicating with persons who are occupying a barred or barricaded room on or about the premises of a hotel, restaurant, billiard room, poolroom or any room above the grade floor in the business district of any town or city is prima facie evidence that gaming was being there carried on by such parties in any prosecution against them, if they have the general reputation of being gamblers, and in all such cases, proof of such general reputation is admissible in evidence.