Automation System
An aneroid barometer

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

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

None of these
Cranfield Institute of Technology, London, 1962
Massachusetts Institute of Technology in 1963
University of Aston, Birmingham, 1960
Imperial college of Science and Technology, London, 1973

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Automation System
Stepping motors:

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

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