Experiments were conducted to determine: 1) sets of geometric symbols which can be discriminated from each other and recognized with high accuracy under a variety of display conditions, especially those involving degradation of the image in ways similar to those that occur on radar displays, and 2) the size and strokewidth to height ratio desirable for symbols to be used on complex displays.
The recommended symbols are illustrated in the report; symbol height should be 1/2 inch or more and the strokewidth should be 1/8 to 1/10 of the height.
Suggestions for combining auxiliary symbols with primary symbols are given.
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