seven o'clock
`` It certainly is , '' agreed Grace . `` And so you expect to make Rainbow Lake by six bells ? '' asked Betty 's uncle , as he paced up and down the rather restricted quarters of the deck . `` Yes , Uncle , by seven o'clock , '' answered Betty , who was at the wheel . `` Six bells -- six bells ! '' he exclaimed . `` You must talk sea lingo on a boat , Bet . ''