7.40 Sundials

8.5 Technology - Mechanics

8.30 Looking at Poems

8.55 Revolutions of 1848

9.20 Mathematical Functions

9.45 Special Relativity

10.10 Mineral Processing

10.35 The Digital Computer

11.0 Water Masses

11.25 Earned Income

11.50 Maths Analysis - Bounds

12.15 J. S. Bach

12.40 The Imperial Roman Army

1.5 R. M. Schindler

1.30 Victorian Music-hall

The first in a short season of films during BBC2's Opera Month. starring
Jeanette MacDonald , Nelson Eddy Mary Robbins is the popular owner of the Polka Saloon in Cloudy Mountain where the Sheriff, Jack Ranee , is in love with her. But a rival for Mary's affections appears on the scene: Ramerez, a handsome bandit.
Screenplay by ISABEL DAWN and BOYCE DEGAW , from the play by DAVID BELASCO Music by SIGMUND ROMBERG
Produced by WILLIAM ANTHONY MCGUIRE Directed by ROBERT Z. LEONARD

Jonathan Cohen , musical director and pianist, presents his own choice of music and songs with Kim Goody and the Co-operation Singers
This week he shows how music can be used to create anticipation and is joined by a group of hand-bell ringers. Musicians
DAVE CHRISTOPHER , JIMMY HASTINGS PAUL ROBINSON , MIKE WARD
Lighting JOHN FARR
Sound ANTHONY PHILPOT
Designer GARY PRITCHARD
Executive producer CYNTHIA felgati Production AVRIL PRICE
(Postponed from 17 March)

Bronze Age Blast-Off
The oldest gold objects in the world have been found in a cemetery in Bulgaria. The oldest copper mine in the world, dug with antler picks and stone hammers, has been discovered in Yugoslavia. A vast prehistoric metal industry has turned up in the Austrian Alps. Could it be that European supremacy in technology took off as long as 6,500 years ago? Narrator
PAUL VAUGHAN

Creators of Modern Philosophy
A series of 15 programmes in which Bryan Magee talks to 15 leading philosophers about Western philosophy today.
12: The Philosophy of Sciencewith Hilary Putnam , Professor of Philosophy, Harvard.
Until this century scientific knowledge was regarded as a body of secure, unchanging facts. Now we know that science is fallible and in a state of perpetual change. This revolution in our conception of what science is lies at the heart of a great deal of contemporary thought. In this programme, it is discussed by one of the world's most eminent philosophers of science.
Series prepared by BRYAN magee Director TONY TYLEY
Executive producer janethoenig Book (same title), 17.50, from bookshops

Tonight's programme shows the Average White Band in concert at the Usher Hall, Edinburgh.
The Scottish group, steeped in American soul music, produce their own unique sound.
Producer HARLEY cokliss. BBC Scotland

Weather

A series of seven film profiles 5: Russell Hoban
An Explorer - of the heart and mind, of fantasy and reality, of myth and religion, of fulfilment and loss. (THE TIMES) An intimate and revealing portrait of this fascinating writer of both children's books and adult novels. RUSSELL HOBAN , author of The Mouse and his Child and Turtle Diary, talks about the themes of his writing and explores his worlds of the London Zoo, lion hunts and clockwork toys. Readings JANET SUZMAN DANIEL MASSEY
Film editor JOHN LYTE Director TONY TYLEY
Producer PETER FOGES

Each week Michael Charlton is joined by two guest interviewers for BBC2's television press conference.
National and international figures -people who are in the news or who make news-discuss and explain their views and intentions.
Producer ANNE MOIR

Introduced by the composer of Evita and Jesus Christ Superstar; Andrew Lloyd Webber
Last summer Russia's most highly-acclaimed living conductor, GENNADI ROZHDESTVENSKY . became principal conductor of the BBC Symphony Orchestra. After his debut with them at last year's Proms, the Guardian critic wrote: 5 have rarely heard such passionate, electrifying playing from them in years'.
In In Performance tonight, Gennadi Rozhdestvensky conducts the BBC Symphony Orchestra leader BELA DEKANY in two works by the most popular of 20th-century Russian composers, Sergei Prokofiev
Romeo and Juliet: Four Dances Symphony No 5
Lighting SAM BRANTER Sound GRAHAM HAINES
Director DENNIS MARKS . BBC Bristol

An anthology of films based on the stories of nine distinguished American authors. Tonight:
The Jolly Corner by HENRY JAMES starring Fritz Weaver and Salome Jens
An expatriate American returns to New York City and is inexplicably drawn to ' The Jolly Corner', a house he knew as a youth 35 years earlier. Gradually the house forces him to find his ' other self ' -a variation of his own identity which is at once frightening and yet strangely appealing.
Written and directed by ARTHUR BARRON Producer DAVID B. APPLETON

Weather

A further chance to see the whole of this afternoon's race, the 133rd running of the world's greatest steeplechase.
Commentators PETER O'SULLEVAN
JULIAN WILSON , JOHN HANMER
Producer FRED VINER

starring The Marx Brothers
Opera lovers may never be able to view II Trovatore in quite the same light again after experiencing the Marx Brothers' famous assault on Grand Opera.
Screenplay by JAMES KEVIN MCGUINNESS Produced by IRVING THALBERG Directedbysamwood