BBC2 年
The 12 and 24 hour clock
For any time before 10 o'clock in the morning, a zero is placed at the beginning. The first two digits show the hour and the last two digits show the minutes. We don't use AM or PM here ...
BBC2 年
The 12 and 24 hour clock
For any time before 10 o'clock in the morning, a zero is placed at the beginning. The first two digits show the hour and the last two digits show the minutes. We don't use AM or PM here ...
Hackaday2 年
Hidden Shaft And Gears Make This Hollow Clock Go
The Hollow Clock has no face, just an open space with an hour and minute hand that move as expected. Only the longer minute hand has any apparent connection to the rest of the clock body ...
BBC5 年
Doomsday Clock frozen at two minutes to apocalypse
When it debuted the clock's hand stood at seven minutes to midnight and it has been reset 23 times since. According to the Bulletin, its design was conceived by artist Martyl Langsdorf.