"We, the undersigned, do solemnly swear (or affirm) that we will perform the duties of examiners of applicants for appointment as inspector of mines or as electrical inspector to the best of our ability, and that in recommending or rejecting said applicants we will be governed by the evidence of their qualifications to fill the position, and not by any consideration of political or personal favor, and that we will certify all whom we may find qualified according to the true intent and meaning of this act, and none other."
52 P.S. § 70-109