Quite easy actually. Clock delay exists of three cogwheels: One for hours, one for minutes and one for seconds. The Seconds-wheel has 60 teeth and makes 1 rotation a minute, it drives the Minutes-wheel which has also 60 teeth and because of that, it is delayed 60 times, so it makes one rotation an hour.
The Minutes-wheel drives the Hours-wheel which has 24 teeth and because of that, it is delayed 24 times, so it makes one rotation a day. On the seconds-wheel every tooth is a second, on the minute-wheel every tooth is a minute and on the hours wheel every tooth is an hour.
Now you will ask: Everything fine, but where are the pointers so I can read time? Pointers are not necessary because you can read time at the point where the wheels nearly meet. Less is more.