Automation System
The SKETCHPAD system

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

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Automation System
Light sensors:

work in direct sunlight
come in a wide variety of mounting styles
None of these
never use infrared light as light source
cannot be used a s limit switches.

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Automation System
Resolution in a CRT refers to:

the number of addressable elements on the tube
None of these
the speed at which the monitor can accept data from the computer
the number of phosphor dots that react when hit by the electron beam
the number of pixels in each square centimeter

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Automation System
Today, programmable controllers:

None of these
can be cost effective even when replacing just a few relays
All of these
are relatively low cost compared with the original digital equipment available for industrial control
are more powerful then the first controllers on the market

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