Correspondence, notes, diagrams and other papers regarding the sub-committees for the Isaac Newton Telescope, including the Optical Committee; the Mechanical Design Committee; the Photo-electric Guiding Committee, with a drawing of the suggested layout for the spectrograph control; the Spectroscopic Committee, with sketch drawings of the electronic photometric equipment and the equatorially mounted telescopes; and Servo-Control, with a study on servo-mechanisms and the design of large telescopes by Peter Fellgett.