Automation System
The SKETCHPAD system

None of these
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
is expensive because it is sophisticated and make demands on the power and resources of the computer.
is used for interactive Graphics
All of these

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Automation System
Stepping motors:

can run both clockwise and counterclockwise
can run at varying speeds
do not require commutators
can be built to index different amounts by changing the pole configuration
All of these

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