What is "viewgraph"

Usage examples of "viewgraph".

It was an honor to be here and he had prepared for weeks, rehearsing with Channing, tailoring his viewgraphs, making up four-color computer graphics to show sinuous flows and ruby-red plasma currents.

Benjamin had not really intended it that way, had left the three viewgraphs out because they seemed a minor digression of little interest to the hard-nosed astrophysicists who made up most of the audience.

He followed with two viewgraphs giving the statistical argument, thick lines of calculations.