Technical Instructions on broadcasting theory and practice were published by
BBC Engineering Division's Technical Publications Department.
They were produced for the benefit of BBC staff, to provide information on many
techniques used in broadcast engineering. Brian Proffitt and Nick Cutmore,
between them, have scanned nearly all of these documents and they can be
downloaded by going to the Pre-1960 TIs and
Post 1949 TIs pages respectively (as you
can see, the dates overlap by a few years).
Back in pioneering days when there were very few manufacturers of
broadcasting equipment, BBC engineers designed many of the items that were
needed. A code was assigned to each design and BBC Technical Publications
department produced detailed descriptions.
Between about 1950 and 1980 over 1000 of these descriptions (including circuit
diagrams) were published in nine large volumes called
Apparatus in Code Order (ACO). These documents
were also referred to as Technical Instructions.
|Acknowledgement and Restrictions
The documents are published here with permission from the BBC and this
support for the preservation of BBC engineering heritage is gratefully
As broadcast engineering has developed a great deal since since these
publications were produced, the documents do not represent present techniques.
However, you must adhere to the following Terms and Conditions:
Any intellectual property rights in these
documents are owned/licensed by the BBC. They are made
available for private study use only and on the understanding that no
warranties are provided by the BBC (in relation to third party
intellectual property rights or otherwise) and that all liabilities
relating to the individual's use of this material rest with the
individual and not with the BBC. The information must not be used
for commercial purposes unless express permission is obtained from the BBC.
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