(a) The said commissioners are empowered to provide a suitable room or rooms in which to transact their business, and to incur all other necessary expenses which shall be paid by warrants drawn as provided in section 6 of this act, and with the approval of said judges or a majority thereof to appoint a clerk and the requisite number of assistants. In counties having 1,000,000 or more inhabitants, the clerk, if there be one, shall be on duty at the room or rooms of said commissioners each day during the session of court; if there be no clerk, then one, at least, of said commissioners shall, in like manner, be present, if so prescribed by the rules hereinafter mentioned. The said jury commissioners shall also have power to summon electors to appear before them and to examine them touching their qualifications for jury service; and each of said commissioners and their clerk and assistants provided for in this act, are hereby empowered to administer all oaths or affirmations required in the discharge of their official duties. Any Circuit Court of this state, in any county where this law is in force, or any judge thereof, upon application of any such jury commissioners may in the discretion of the court compel the attendance of electors and the giving of testimony before the said jury commissioners, by attachment for contempt or otherwise, in the same manner as the production of evidence may be compelled before said court. Every person, who having taken an oath or made affirmation as herein provided, shall swear or affirm willfully, corruptly and falsely, shall be guilty of perjury, and upon conviction shall be punished accordingly.
     (b) In a county with a population of at least 3,000,000, if a jury administrator is designated by the chief judge of that circuit to perform the functions of jury commissioners, the chief judge of that circuit is authorized to provide a suitable room or rooms in which to transact the business of qualifying jurors and to incur all the other necessary expenses to be paid by the county treasurer. The chief judge for that circuit is authorized to designate a requisite number of assistants to aid in the functions of qualifying jurors.