In all other cases, if at any time during the progress of any cause, it shall, in the opinion of the court, become necessary to determine any fact in controversy by the verdict of a jury, the court may direct an issue or issues to be made.
Mo. R. Civ. P. 71.03
Committee Note – 1959
This Rule is the same as Section 108 of the 1943 Code (Section 510.240, RSMo 1959).