FIELD: physics.
SUBSTANCE: clocks, having a clock mechanism, a hand mechanism, a clock face and a means of displaying current time on the clock face using an hour hand and a minute hand, are configured to display one of four periods of the day "night", "morning", "day" or "evening" and display current time of that period of the day using a means of displaying current time of the period of the day, having a disc with numbers of hours having 12 values of the numbers of hours with series-arrangement of the number of hours on the disc - 12, 6, 1, 7, 2, 8, 3, 9, 4, 10, 5, 11 or 6, 12, 7, 1, 8, 2, 9, 3, 10, 4, 11, 5, situated under the clock face coaxial to the hour hand and configured to alternately move four times a day once in six hours, forward and backwards by an angle of up to 30 degrees to allow display in clock face windows of the corresponding numbers of hours of the current period of the day.
EFFECT: clearer time reading and easier distinction of morning and day hours from night hours.
18 cl, 19 dwg
