When two or more persons shall have been charged together in the same indictment or information with a crime, and one or more shall have demanded a separate trial and had the same, and when the court shall be satisfied by reason of the same evidence being required in the further trial of parties to the same indictment or information, that the regular panel and bystanders are incompetent, because of having heard the evidence, to sit in further causes in the same indictment or information, then it shall be lawful for the court to require the clerk of the court to write the names of sixty electors of the county wherein such cause is being tried, each upon a separate slip of paper, and place the same in a box, and, after the same shall have been thoroughly mixed, to draw therefrom such number as in the opinion of the court will be sufficient from which to select a jury to hear such cause. The electors whose names are so drawn shall be summoned by the sheriff to forthwith appear before the court, and, after having been examined, such as are found competent and shall have no lawful excuse for not serving as jurors shall constitute a special venire from which the court shall proceed to have a jury impaneled for the trial of the cause. The court may repeat the exercise of this power until all the parties charged in the same indictment or information shall have been tried.