(to 7.20)

A look at the physics of equilibrium systems.
A BBC/Open University production

Cricket
The NatWest Bank Trophy Second round
Further coverage of one of today's matches.
World Show Jumping Championships from Aachen
Today's event is the first leg of both team and individual competitions and is one round against the clock.

The first of six films about the things we use and the people who design them. The Truck
Truck drivers are the most discriminating critics of the vehicles they drive. What happens when you put them together with 38 tonnes of Leyland 'Roadtrain' and the design engineers who produced it?
Film editor ROLAND TONGUE Series producer IAN WOOLF Producer SAM BERRISFORD

For this award-winning eight-part series (the title is an Inca term for gold and silver)
Jack Pizzey spent 18 months in 'the least-reported and most exciting region' in the world. He travelled the length and breadth of the continent to report on every aspect of South American society: from Argentina's 'dirty war' to Brazil's carnival.
Tyrants Will Rise from My Tomb
Simon Bolivar is venerated the length and breadth of South America for ending Spanish colonial rule 150 years ago. Yet, as he so accurately prophesised, his death was followed by dictatorship after dictatorship. Why has South America been dominated by the generals? In search of the common factors behind the viscious circle of revolution and oppression, Jack Pizzey went to Pinochet's Chile and Bolivia, a country named after the great liberator, where the military are waiting in the wings. Produced and directed by CLIVE FLEURY
An AUSTRALIAN BROADCASTING CORPORATION production

starring with Divided We Stand
Battle stress hits everyone, people do crazy things, but Frank's complaints make the 4077th sound like bedlam. A psychiatrist is sent to assess the crack-up rate and the possible breaking-up of the unit. The evidence is overwhelming, but if these people were not all half-crazy, they would go insane ... Written by LARRY GELBART
Directed by JACKIE COOPER (R)

A comedy by PETER BUCKMAN The weekly brass band rehearsal is an enjoyable, light-hearted occasion.
Then Mathew, the conductor, introduces James, a newcomer to the village, who is an enthusiastic bandsman from the north, where they do these things properly.
Musical advisor ROBERT MANDELL Lighting BARRY CHATFIELD Sound ROGER GUEST
Designer MARY SPENCER Producer ROBIN MIDGLEY Director DAVID ATTWOOD BBC Pebble Mill
● FEATURE: page 13

from the Silk Cut Festival Join commentator
David Allan for this week's selection of country styles, ranging from classics to contemporary, recorded at the Wembley Arena. Featuring
Hank Williams ' Original Driftin' Cowboys Margo Smith
Johnny Duncan , Jeff Hanna and Marie Osmond
Festival organiser MERVYN CONN Sound
PAUL CUNUFFE , BARRIE HAWES Lighting JOHN WIGGINS Designer COLIN GREEN Directors
DAVID MITCHELL , STEVE MORRIS Producer DAVE PERROTTET

11.30 Weatherview

The NatWest Bank Trophy Second round
PETER WEST introduces highlights from today's play. Producer KEITH MACKENZIE

12.10 Harris Tweed
The development of industrialisation in controlled laboratory experiments on the islands of Harris and Lewis, where wool spun in a factory is still woven by hand.
(R)

12.35 Drinking Motivation in Animals
Models and diagrams are used to explain the mechanism of drinking, and film illustrates the drinking behaviour of animals in the wild and in controlled laboratory environments.
(R)

(to 1.05)