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The Harwell Catapult has recently been dug up as part of the ongoing site reclamation project .
Harwell Catapult
The Catapult was Pneumatic and used a large number of Kestrel engines as both motive power and compressors. The Oxford group of the PFA had a lecture from the Harwell
PR officer about the Harwell site up to the time that The AERE was established and during this a number of drawings and pictures of the catapult were shown although the exact details of how it was operated have been lost it was an impressive bit of engineering. If you contact Harwell
PR office they may still have copies of the edition of the house magazine "The Echo" which featured the history of the catapult.