IBM 3270 G Manual page 26

Figure 6. Enlargement of Part of the Steam Locomotive
Both the 3270-PC/G and /GX work stations provide the graphics function
that allows you to move around and scale parts of graphics pictures.
Figure 5 shows a drawing of a steam locomotive displayed on a 5279
display. Figure 6 shows an enlargement of the cab of the locomotive.
The 5279 is ideal for displaying pictures from engineering data bases for
general review. For more complex pictures, such as the diesel engine
shown in Figure 10, the higher resolution and better interactive
performance of the 5379 might make it more suitable.
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Chapter 2. What the Work Stations Can Do for You
15