A letter from J.D. Pope regarding N.H.O. telescopes, discussing the feasibility of using enhanced reflectivity optical systems for the Coudé focus of the 2.5m telescope and for the Nasmyth focus of the 4.5m telescope.

A letter from J.D. Pope requesting alterations to the wording of item 11 in the minutes of the N.H.O. Panel on Drive and Control and Mountings concerning obtaining opinions from astronomers.

A letter from J.D. Pope, 20 June 1972, on subjects for inclusion in the list of feasibility studies in preparation, accompanied by notes on telescope costs.

A letter from J.D. Pope requesting Redman's comments on the suggested programme for the presentation of cost estimates for the Northern Hemisphere Observatory project.

A letter from J.D. Pope, 2 October 1968, regarding secondary mirror supports, and enclosing his letter to John C. Farrell, Dilworth, Secord, Meagher and Associates, 30 September 1968, concerning the closed loop vacuum system and loads on defining points of the primary mirror, accompanied by drawings.

A letter from J.D. Pope, 29 May 1970, enclosing Pope's 'AAT Cassegrain Guiding Head Design Proposal No. 2', and discussing his planned visit to the U.S.A. and U.K. There is also a copy of Redman's reply of 2 June 1970.

A letter from J.D. Pope asking for comments on the specification for the 660 mm acquisition television finding telescope and on a proposed list of tenders.

A letter from John Hutchinson, Science Research Council, 21 September 1971, with a copy of letter of the same date sent to G. Carpenter, J.G. Davies, J.D. Pope and V.C. Reddish, inviting the recipient to join the prospective N.H.O. Panel on Drive and Control and Mounting, to be chaired by Redman.

A letter from J.W. Gietzen, Royal Greenwich Observatory, enclosing a copy of a note by J.D. Pope, 1 April 1974, entitled 'Light losses in telescope Coudé optical trains with particular reference to 3 mirror and 5 mirror systems'.

A letter from M. Carpenter confirming flight times for the visit by Redman and J.D. Pope to Toledo, United States.

A copy of a letter from Roger Griffin to J.D. Pope discussing a questionnaire for potential users of the Northern Hemisphere Observatory and criticising the cost comparisons given in Pope's February report to the N.H.O. Panel.

A copy of a letter from R.V. Willstrop to J.D. Pope regarding the spectrographs and altazimuth mountings on drawing M-024-T of the Isaac Newton Telescope and a 4.5m telescope.

A copy of a letter from R.V. Willstrop to J.D. Pope commenting on the draft specification for the new Isaac Newton Telescope primary mirror.

A letter from Redman to R.J. Harris enclosing Redman's notes on his visits to Australia and Canada to discuss the Anglo-Australian Telescope and other matters, including his informal discussions with S.C.B. Gascoigne and J.D. Pope at Canberra, 18 March 1970; the preliminary astronomers' meeting, Canberra, 20 March; the Joint Policy Committee meetings, 24-25 March; his visit to Mount Koban, 29-30 March; and his visit to the Dominion Astrophysical Observatory, Victoria, B.C., 31 March.

A copy of a letter from Redman to J.D. Pope containing detailed comments on Pope's 'Specification for Cost Studies of Altazimuth Mounted Optical Telescopes'.

A copy of a letter from Redman to J.D. Pope listing the main changes in the third draft of the User Specifications circulated to members of the N.H.O. Panel Committee.

A letter from Redman to J.D. Pope stating that he had not realised that he was expected to prepare a scientific case for the Northern Hemisphere Observatory in cooperation with Malcolm Smith until the Planning Committee minutes arrived.

A photocopy of a letter from Redman to J.D. Pope regarding Anglo-Australian Telescope setting errors.

A copy of a letter from Redman to J.D. Pope, 27 June 1970, regarding the system for focus stabilisation to be adopted for the Anglo-Australian Telescope. He describes the problem of focus control relating to changes of temperature in the steel of the telescope tube, and discusses possible courses of action.

A copy of a letter to J.D. Pope regarding the I.N. Hartmann test material for the Isaac Newton Telescope and the telescope's comatic image, with a manuscript note at the end of the letter concerning E.H. Linfoot's views.

A copy of a letter from Redman to J.D. Pope enclosing detailed comments on the Cassegrain acquisition and guiding unit, proposal no. 2.

A copy of a letter from Redman to J.D. Pope enclosing a copy of his plot of the right ascension setting errors.

A copy of a letter to J.D. Pope commenting on 'Telescope de 3.6m' by Cayrel and Belly.

A copy of a letter from Redman to J.D. Pope commenting on the Freeman Fox and Partners report on the domes and buildings of the Northern Hemisphere Observatory.

A letter from Redman to M.H. Jeffery, 19 July 1968, regarding Redman's discussion with J.D. Pope, including mention of the telescope tube; the problems caused by dust at the Siding Spring Observatory; and worms, spur gears and friction drives. There are accompanying notes by Redman, dated 20 July, entitled 'Why Worms? Why Not?', written in reply to notes by J. Rothwell entitled 'Why Worms?', 5 July, a copy of which is included.