Boyle, A. R.2019-01-212019-01-211977-04April 1977http://hdl.handle.net/10388/11747A feasibility study of dark-trace cathode ray tubes for large screen display of high resolution cartographic data,is described. Following a comprehensive study of various display methods, optical projection of dark trace tube images was chosen for experimental investigation. Var- ious types of cathodochromic targets and optical systems were studied. It was found that a satisfactory system could not be constructed using available components, but would require the design of a unique CRT target and optics system.Thesis