- chart, a circular letter announcing the retirement of V. Markus from the position of Managing Director of Ferrostatics Limited dated August 1965

- drawing of a high pressure vessel, monobloc construction for 200,000 psi working pressure from Pressure Products INC (UK) Ltd dated 18th March 1965

- notes entitled 'Vessel of 15,000 atmospheres'

- notes entitled 'Case of True Elasticity/True Plasticity'

- draft of report P.P.I. U.K. 30 entitled '200,000 P.S.I. Vessel. Autofrettage Test at Belfast University August 19th - 20th 1965' dated 23rd August 1965

- letter from K. Ashcroft Chief Engineer Pressure Products Incorporated (UK) Ltd to W.R.D. Manning dated 18th June 1965 and entitled '200,000 p.s.i. Vessel for Manchester University Geology Department' forwarding a test report and reporting on the manufacture of the vessel

- letter from K. Ashcroft Chief Engineer Pressure Products Incorporated (UK) Ltd to W.R.D. Manning dated 5th May 1965 and entitled '200,000 p.s.i. Vessel for Manchester University forwarding a letter from Mr Pugh and discussing autofrettage

- letter from K. Ashcroft Chief Engineer Pressure Products Incorporated (UK) Ltd dated 23rd March 1965 forwarding correspondence relating to an order placed by Ferrostatics

- copy of a letter from K. Ashcroft Chief Engineer to F. Rodgers, Messrs Hadfields Ltd dated 19th March 1965 and entitled 'Ferrostatics Order No: X.4183 - Forging for 200,000 p.s.i. Pressure Vessel' relating to estimates provided by Pressure Products Incorporated (UK) Ltd

- Copy of a letter from Sales Manager Forging Division Hadfields Limited to Messrs Ferrostatics Ltd dated 26th February 1965 and entitled 'Your Order No: X.4183' relating to the machining and testing of the vessel body

- copy of a purchase order for a pressure vessel body

- letter from K.E. Bett, Imperial College of Science and Technology, Department of Chemical Engineering and Chemical Technology to W.R.D. Manning dated 16th December 1964 relating to an examination of a pressure vessel for Manchester University

- copy of a letter to Jan F. Smulders, P.P.I. (UK) Ltd dated 9th December 1964 relating to the strength and safety of a pressure vessel for Manchester University

- letter from J.F. Smulders Pressure Products Incorporated (UK) Ltd to W.R.D. Manning dated 7th December 1964 and entitled 'Manchester University Geology Department 200,000 p.s.i. reactor P.P.I. (UK) order No 30 relating to the design pressure of the vessel

- copy of a letter from F. Rodgers Hadfields Limited to Dr K.E. Bett, Imperial College of Science and Technology, Department of Chemical Engineering and Chemical Technology dated 2nd December 1964 relating to the stresses placed on a 15,000 atmospheres pressure vessel