The several cities of this commonwealth may provide for a bureau of elevator inspection, to be in charge of a chief inspector, and containing such and so many other inspectors and employés as may, from time to time, be needed for the proper management of said bureau. The salary of the chief inspector and other inspectors and employés shall be such as may, from time to time, be fixed by ordinance. In cities containing a department of public safety, the said bureau shall form a bureau of said department. In all other cities it shall be an independent bureau, subject to such control as may be determined by ordinance.
53 P.S. § 4141