FIELD: physics.
SUBSTANCE: clocks are configured to alternately display the current ante meridiem and post meridiem periods through a disc placed under the clock face, the disc having numbers of hours having twenty four values of the number of hours with the values of the numbers of hours arranged consecutively around the disc 1, 13, 2, 14, 3, 15, 4, 16, 5, 17, 6, 18, 7, 19, 8, 20, 9, 21, 10, 22, 11, 23, 12, 24 (or 0) or 13, 1, 14, 2, 15, 3, 16, 4, 17, 5, 18, 6, 19, 7, 20, 8, 21, 9, 22, 10, 23, 11, 24 (or 0), 12, arranged coaxially with the hour hand and configured to alternately move twice a day once in twelve hours forward/backwards by an angle of up to 15 degrees to allow the display in clock face windows of the corresponding numbers of hours of the current ante meridiem or post meridiem period.
EFFECT: high accuracy of displaying current time in different periods of the day.
35 cl, 21 dwg
