one o'clock
`` Oh , I 'm sure I 'll never learn that , '' sighed Amy . `` It is very simple , '' explained Betty , `` Now it is eight bells -- twelve o'clock noon . At half-past twelve it will be one bell . Then half an hour later , it will be two bells -- one o'clock . You see , every half hour is rung . '' `` Worse and worse ! '' protested Mollie .