The large weight simply powers the clock by gravity. The blowtorch part of the video shows the triple-sided chain attached to the weight.
Visitors to the block will wind up the weight in order to hear the chimes. The clock chimes once per day, and a mechanical computer varies the chime such that it is different each day for the full 10,000 years. If it's not wound, the chimes are silent.
The time-keeping function of the clock is much smaller and can run for a long time without anyone winding the clock. The idea is that even if there is a serious calamity, the clock will continue to keep time until it's found again and wound by visitors.
The large weight simply powers the clock by gravity. The blowtorch part of the video shows the triple-sided chain attached to the weight.
Visitors to the block will wind up the weight in order to hear the chimes. The clock chimes once per day, and a mechanical computer varies the chime such that it is different each day for the full 10,000 years. If it's not wound, the chimes are silent.
The time-keeping function of the clock is much smaller and can run for a long time without anyone winding the clock. The idea is that even if there is a serious calamity, the clock will continue to keep time until it's found again and wound by visitors.