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Font variations in vector plotter lettering

Introduction Pen-and ink vector plotters have recently become standard equipment in most computer installations. These drum or flatbed hardware devices are driven most often by a standard plotting software package supported by the hardware vendor (see Dunn and Herzog, 1977). Such software provides for the usual array of point symbol and vector mode line drawing but contains only a single type font for graphic character display. This lettering style is generally a standard, regimented one (usually a hybrid of Simplex Roman) and is appropriate for crude work graphs of minor graphical quality. Browsing through scientific journals or observing messages and labels generated from these standard plotting packages testifies to the inadequacy of using this restrictive type font for effective text communication. The graphic and communicative quality of a plot rests heavily on its annotation. The recognition of the attribute(s) to which the text applies, the ease with which the lettering can be read and interpreted, and the 'balance' it renders to the rest of the plot are all essential aspects of graph/map design (Robinson and Sale, 1969). Since the standard plotting systems provide only a letter size variation capability and do not furnish pen-stroke width and intercharacter spacing features, they are not adequate software media for generating the proper text-to-plot relationship that is necessary for effective reader communication. On the other hand, sophisticated lettering packages are currently on the market that offer a menu of lettering styles (see, Hershey, 1969; DISSPLA, 1970). The lettering system designed by A.V. Hershey, for example, is based on an extensive font collection where the characters are constructed by a succession of pen-strokes. Though the various styles are of superior quality for small font sizes, the Hershey package degenerates for plotting graphic characters of