Each member of the governing board of any park district before entering upon the duties of his office shall take and subscribe an oath to well and faithfully discharge his duties, which oath shall be filed with the secretary of said board. The members of such governing board shall constitute the corporate authority for such district and a majority of such members shall constitute a quorum for said board at any meeting thereof. The members of such governing boards shall act as such without compensation, and each member of the board shall be a legal voter of and reside within such district.