20 DISPLAY WITH ENTROPY
A concept of entropy is developed as an information theory sense as applied to character generation of the cathode ray tube display.
By Charles Halsted

28 SIMPLIFIED METHODS FOR DETERMINING DISPLAY SCREEN RESOLUTION CHARACTERISTICS
Techniques for determining display screen sizes, resolutions, and vievving distances and areas for small and large screen display systems are presented.
By Roger S. Walker

32 COMPARISON OF IMAGE DEGRADATION IN PHOTOGRAPHIC AND IMAGE ORTHICON SYSTEMS
Compares various image degrading effects of both image tubes and photographic materials as receptors for use on space objects.
By. Walter E. Woehl

18 EDITORIAL: Jim Belcher discusses up-coming symposium

37 INFO '68: planning report

38 SID ACTIVITIES: local and national news

41 READOUT: display industry news

44 BUSINESS NEWS

45 TECHNICAL PRODUCT ARTICLE

46 NEW PRODUCTS: innovations from many firms

51 NEW LITERATURE: data available on items and ideas

52 ON THE MOVE: people - their appointments, promotions

54 CORRESPONDENCE

55 ADVERTISERS' INDEX: for finding them quickly