Drawings and pictures are more than mere ornaments in scientific discourse. Blackboard sketches, geological maps, diagrams of molecular structure, astronomical photographs, MRI images, the many varieties of statistical charts and graphs: These pictorial devices are indispensable tools for presenting evidence, for explaining a theory, for telling a story.

Electrical diagrams show device interconnections.

A common way to represent change in state over time is via a timing diagram.

This particular diagram represents a dinosaur in the distant past and a person who is born in AD 2000. These objects stretch out horizontally in the graph because they last over time in reality, and time is the horizontal axis on the graph

Various terms for this type of graph seem to be used interchangeably: 'scatter diagram', 'scatter graph' and 'scatter plot'.

This powerful visual tool, known as the sawtooth diagram, is used to analyze inventory behavior over time.

We can then chart them over time and it results in that kind of a diagram.

The timing and diagramming staff, too, were on duty for up to 21 hours devising 80 engine, 60 guards' and 25 carriage working diagrams.

Diagram

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