I have a collection of world clocks from different countries.

I have a collection of carriage clocks.

I have two vase clocks in my living room.

They used chess clocks to keep track of their time during the game.

The longitude clocks are used to determine the longitude of a location.

The slave clocks in the building are all synchronized to the master clock.

Light clocks are used to measure time in special relativity.

Our body clocks regulate our sleep-wake cycle.

I have two case clocks in my living room.

Chemical clocks are used to measure time in chemical reactions.