Automation System
The concept of a general CAD system was that it should provide:

All of these
A set of basic system functions and utilities.
A system for the operation of applications programming.
None of these
A system for handling user actions.

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Automation System
An aneroid barometer

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

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