about nine o'clock
`` And I guess Mary will be , too . I wonder if he 's going to ask her to the exhibition ? '' It developed that Tom had done so , a fact which Ned learned on the morning of the day set for the test . `` Come over about nine o'clock , '' Tom said to his chum . `` I guess it will be dark enough then . '' Meanwhile Schwen and Otto Kuhn , the other man involved , had been locked up , and all their papers given into the charge of the United States authorities . A closer guard than ever was kept over No. 13 shop , and some of the workmen , against whom there was a slight suspicion , were transferred .