Section 5. It shall be the duty of the Department of Public Health and Charities, in every city of the first class, to make quarterly inspections of all parts of every tenement-house, to ascertain whether all the provisions of this act and of other acts, and of the rules and regulations of the Department of Public Health and Charities pertaining to tenement-houses, are being properly observed. For this purpose, the director of the said Department shall have authority to employ two tenement- house inspectors, at a salary of not more than twelve hundred dollars each, and such additional inspectors as he may deem necessary, in order to secure the enforcement of the provisions of this act. These additional inspectors shall receive salaries to be fixed by the said director, subject to the approval of the mayor. Councils shall annually appropriate the sums necessary for the payment of the salaries of the tenement-house inspectors, and of such other inspectors as may be appointed under the provisions of this section. The inspectors shall report immediately, to the said Department, the result of every inspection. In every case where such reports indicate a breach of the building laws they shall be forthwith certified to the Bureau of Building Inspection.