Any county commission by order entered of record and any municipality by ordinance or any county and municipality by joint agreement may, if it or they so desire, establish a museum commission hereinafter, in this article referred to as the commission, to consist of not less than five nor more than ten appointees to be appointed by the county court or the mayor, as the case may be, and in the case of cooperative efforts between counties and municipalities, hereby authorized, each authority is to have equal appointive power.