Rule 39. Trial by Jury or by the Court
(a)
When a Demand Is Made. When a jury trial has been demanded under Rule
38, the action must be designated on the docket as a jury action. The trial on all issues so demanded must be by jury unless:
(b)
When No Demand Is Made. Issues on which a jury trial is not properly demanded are to be tried by the court. But the court may, on motion, order a jury trial on any issue for which a jury might have been demanded.
(c)
Advisory Jury; Jury Trial by Consent. In an action not triable of right by a jury, the court, on motion or on its own: