Automation System
The SKETCHPAD system

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

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Automation System
An aneroid barometer

can be used to measure gas or liquid flow rates
measures pressure by sensing deflection of an evacuated chambers.
None of these
can measure only atmospheric pressure
is very unreliable

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