British Telecom digital archives
http://www.digitalarchives.bt.com/CalmView/Default.aspx?
Welcome to the BT Digital Archives
Their catalogue can be used to search the thousands of documents, books, objects, images and films on subjects spanning the development of telecommunications, from the birth of the electric telegraph in the 1830s to the explosion of the internet and the rise of broadband Britain.
The “Collections showcase” features some of our most significant collections.
In “About our Catalogue” you’ll find background information on the collections available and an explanation of the Digital Archives project.
To get the most from the catalogue you’ll want to take a look at “How to search our collections”.
If you just want to get searching then head straight for the Search box top-right or the Advanced search.This archive documents over a century of the achievements of British telecommunications engineers and scientists. It brings together more than 500,000 unique photos, reports and correspondence dating as far back as 1846.
Free to use, it offers access to material from each of BT’s former existences, including the General Post Office and the Electric Telegraph Company – the world’s first telecoms provider.
Family historians are able to discover more about their ancestors’ lives as employees as well as learn about changing technology and its impact on society.