It is hereby declared that the power of a court to adjourn the hearing of a case includes power, after a person has been convicted or the court has found that he committed the offence and before he has been sentenced or otherwise dealt with, to adjourn the case for the purpose of enabling inquiries to be made or of determining the most suitable method of dealing with his case:
Provided that a court shall not for the purpose aforesaid adjourn the hearing of a case for any single period exceeding three weeks.