Upon filing the report by the special master, the court, without delay, shall fix a date for hearing objections filed thereto. Notice that the report has been filed, that all objections thereto shall be filed with the court within ten days after the date of mailing the notice, and that the court has fixed a certain date, which shall be stated therein, for the hearing of such objections, shall be given by sending a copy of the notice by registered mail to all persons who have appeared in the action, or their attorneys of record, at their last known addresses. After ten days subsequent to mailing the notice, all objections to the report shall be deemed waived by all persons who have not filed written objections with the court.