Correspondence regarding the finance and design of the Isaac Newton Telescope, including official correspondence; reports and correspondence on meetings of the Board of Management; and correspondence with Sir Howard Grubb, Parsons and Co. Ltd on documents, including a copy of Report No. 3 on the 98" Isaac Newton Mirror (1955), a drawing of the 80"-98" duplex telescope proposed servo-optical alignment system (1955), a graph of tests on the 98" spherical mirror for the Isaac Newton Telescope (1955), and photographs No. 3724 and No. 3725 showing the observing bridge over the impregnating tank and a view looking down into the tank on the 98" mirror (1954).