Contains correspondence for an order for a salt nitrate bath from Sasol Ltd. Six unidentified monochrome postcard size photographs of telescopes etc. Two monochrome photographs of equipment, negative Nos. 7097 and 8756/2. One monochrome contact sheet titled 4" Reflector, dated May 1973, Reference No. T-1-8. Paper: New Instruments, Materials and Tools from The Institute of Physics, Vol. 23, March 1946. Various other correspondence.