Sound and vision blog

Sound and moving images from the British Library

06 December 2013

Rescuing the Rivonia Trial recordings

A recording of Nelson Mandela’s remarkable speech delivered during the notorious Rivonia Trial of 1963-4, frequently quoted since his death last night at the age of 95, was heard for the first time in 2001 thanks to the British Library.

Speaking from the dock on 20 April 1964 during the Trial in Pretoria’s Palace of Justice, Mandela gave a spellbinding three-hour speech in his defence. Mandela (‘Accused Number One’) was charged with acts of sabotage designed to ‘foment violent revolution’.

His defiant closing words -

“the ideal of a free and democratic society in which all persons will live together in harmony and with equal opportunities…is an ideal for which I am prepared to die”

were widely reported in print and sent shockwaves around the world, leading to worldwide condemnation of South Africa’s racial policies. Mandela escaped the death penalty, but began a life sentence at Robben Island prison in June 1964. He was not released until 11 February 1990.

In 2000, during a visit to South Africa, a chance conversation between the British Library’s Oral History Curator Rob Perks and colleagues at the South African Broadcasting Corporation (SABC) and the National Archives of South Africa revealed that rare ‘Dictabelt’ recordings of the trial existed, but that no means had been found to replay or transfer the sound. Knowing that the British Library’s Sound Archive still owned one of the rare recorders, Rob offered to make the transfers.

Trial transcript(Belts1-7)

Loaned to the British Library, these dictabelt recordings are
preserved in the National Archives of South Africa

Seven of the blue Dictabelts were loaned to the British Library and later returned to the custodianship of the National Archives of South Africa who retain all copyright in them. Discovering that the belts had been recorded at lower than normal speed in order to extend the recording time, Sound Archive audio engineers Peter Copeland and Adrian Tuddenham modified the Sound Archive’s Dictabelt machine to allow correct playback speed, which could be determined from low level mains hum, inadvertently recorded onto the belts at the time. By replaying the hum at the correct pitch it follows that the recording itself was replayed at the correct pitch. They also found they had to apply heat to the belts to smooth out the creases and allow playback with minimal groove-jumping.

Trial transcript(Belt 1) 

The sound was then passed to Sound Archive engineer Nigel Bewley, who corrected the frequency response, carefully edited the sound to repair the groove-jumps and the reduced the surface noise using CEDAR (Computer Enhanced Audio Restoration). The resultant audio quality is remarkably clear considering the recording technology used, allowing Mandela’s speech to be heard again for the first time since the Trial.

The Rivonia Trial of 1963-4, one of the most important political trials of the twentieth century, marked a turning point in South Africa’s history and the struggle against apartheid. Attracting huge international attention at the time, ‘Rivonia’ led to the world-wide condemnation of South Africa’s racial policies.

On 9 October 1963 at the Palace of Justice in Pretoria, Nelson Mandela, Walter Sisulu, Dennis Goldberg, Govan Mbeki, Ahmed Kathrada, Lionel Bernstein, Raymond Mhlaba, James Kantor, Andrew Mlangeni and Elias Motsoaledi - leading members of the African National Congress (ANC) - were charged under the General Law Amendment (Sabotage) Act and the Suppression of Communism Act with acts of sabotage designed to foment ‘violent revolution’ and overthrow the state. Named ‘Rivonia’ after the Johannesburg suburb where sixteen ANC leaders had been arrested in July 1963, the full trial began on 3 December 1963 and culminated on 12 June 1964 in life sentences for eight of the accused. Nelson Mandela was the last to be released on 11 February 1990 after 27 years in jail.

Rob Perks, Lead Curator of Oral History


Listen to audio clips recovered from the 1964 dictabelts

Audio extracts from NSA C985, transferred by the British Library from the Dictabelt originals loaned by The National Archives of South Africa and © The National Archives of South Africa.

20 April 1964, Nelson Mandela.

01 Defence Council, Bram Fischer; end of opening remarks; Prosecutor Percy Yutar; Justice De Wet; Nelson Mandel, beginning of his statement from the dock

 02 Nelson Mandela; the ANC and guerrilla warfare

 03 Nelson Mandela; communism; African poverty

 04 Nelson Mandela; the effects of white supremacy

 05 Nelson Mandela; closing remarks _ it is an ideal for which I am prepared to die_



I want to learn about digitisation of dictabelts. I want to know what technology was used. I want to know the whole process of digitising dictabelts

We appreciate the work done by the British Library. May I please get a detailed report or manual that elaborate on the steps taken to prepare dictabelts for digitisation. I would like to know more about the adherence to any standards or not. I need this information for scholarly purposes. Please help me.

Is it true that dictabelts are mechanical carriers but also there are magnetic dictabelts? I do not understand but need clarity please.
May I please know if it is possible to get a booklet that have all types of dictabelts and all dictabelt play back machines

I am busy with a research on digitisation if dictabelts. I wish I could visit the British Library to learn about the process of digitising dictabelts sound recordings.

Dear Nthabiseng,
Thanks for your questions. These dictabelts are mechanical carriers. There is a pretty comprehensive write-up in an issue of the IASA journal of how my British Library colleagues first rescued these iconic recordings in 2000. And fortunately all IASA journal issues have been published online in the past month on the IASA website. See "Recovering the sound from the Rivonia Trial" by Adrian Tuddenham, Peter Copeland, and Nigel Bewley (IASA journal no 17, June 2001, pp 10-17)
Online at:

The British Library digitised 7 of the dictabelts held in the South African archives. There are dozens more, and all are now being digitized in France by INA. You can find out more in September at the IASA 2015 Paris conference by attending this presentation: ("Saving South-African heritage: Rivonia trials original dictabelts digitizing").

Best wishes
Richard Ranft, Head of Sound & Vision, The British Library

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Your comment could not be posted. Error type:
Your comment has been saved. Comments are moderated and will not appear until approved by the author. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.


Post a comment

Comments are moderated, and will not appear until the author has approved them.