A set of 122 drawings, originally in two rolls labelled 'RI Image Tubes General, X3082-Y5752 (V and W size sheets)' and 'RI Image Tubes General, X3082-Y5752 (X,Y, and Z size sheets)'. Includes V, X, Y and Z sized sheets, V being the largest.

A set of 25 drawings of the fridge and air drying plant for Schmitt Camera A, located in in Dome F of the Equatorial Group of Telescopes at the Royal Observatory, Herstmonceux. Originally in a folder so labelled. Includes a set of 13 drawings of the 'Air Dryer Change Over Circuit'.

A set of 42 drawings relating to the Visual Refractor in Dome F of the Equatorial Group of Telescopes at the Royal Observatory, Herstmonceux. They were originally rolled together and labelled 'QP Equatorial Group, F Dome, Visual Refractor, main structure, 1st system nos not m/f'. Includes V, W, X, Y and Z size drawings, V being the largest.

A set of 39 technical drawings, originally rolled together and labelled 'RD Instrus. [Instruments] Dev. and Gen. User, Drg Nos AZ/002, X/BA/001, X/BB/001 and V/FD/000'. Includes V, X, Y and Z sized sheets, V being the largest. Many (if not all) relate to instruments designed for the Isaac Newton Telescope at La Palma, including drawings of the Image Photon Counting System (I.P.C.S) which was first used in March 1984.

A set of 11 drawings originally rolled together and labelled 'QF Equatorial Group B Dome 36" Refractor (Yapp) and QI Equatorial Group C Dome 34" Schmitt Camera Building and Dome'. Includes Y and Z sized sheets. It is unclear which drawings relate to which of the two domes at RGO Herstmonceux.