Channel

British Sign Language (BSL)

Cassiobury Park turret clock

Modified and now restored, a 17th century tower clock.
The clock is weight-driven and has two separate gear trains mounted side by side. One is the going train which regulates the time and is controlled by a verge escapement with an oscillating foliot with adjustable weights. The other is the striking train which determines the number of blows struck by the hammer on a bell, probably mounted above the clock. Over the years the clock has been modified and restored, but now resembles, in essence, its original conception as a seventeenth century tower clock. The clock is marked with a scallop or cockle shell and is one of a group of five such clocks.

Related playlists

• British Sign Language

Downloads

• Download video

Popular BSL videos

 

The Lewis Chessmen

The chess pieces consist of elaborately worked walrus ivory and whales' teeth in the forms of seated kings and queens, mitred bishops, knights on their mounts, standing warders and pawns in the shape of obelisks.
Play video 

 

Statue of Ramesses II

One of the largest pieces of Egyptian sculpture in the British Museum, this statue shows Ramesses II, who succeeded his father Sethos I in around 1279 BC and ruled Egypt for 67 years.
Play video 

 

The Rosetta Stone

A valuable key to the decipherment of hieroglyphs, the inscription on the Rosetta Stone is a decree passed by a council of priests.
Play video