"DEPOT OF MILITARY KNOWLEDGE. In March 1803 the quartermaster general, Sir Robert Brownrigg, established a Depot of Military Knowledge to collect intelligence in peacetime and prepare maps. Colonel Lewis Lindenthal was placed in charge of the Library Section, which became the repository of information about topography and enemy forces" p. 150:

Nigel West. Historical Dictionary of British Intelligence. 2005:

https://epdf.pub/historical-dictionary-of-british-intelligence-historical-dictionaries-of-intelli.html