Taylor and Fiske (1975) arranged two people facing each other having a conversation, with other people sat in a circle around them. Afterwards, they asked the people from the circle to attribute cause for several incidents. The people attributed more to the people whose faces they could see better.
Job Description: Transportation Security Screener duties include providing frontline security and protection of travelers, airports and airplanes by identifying dangerous objects in baggage and on passengers.
The high frequency vibrating screens will often be used as a secondary screener as its purpose is to separate the finer minerals. This not only ensures good separation efficiency, it will also help to maintain the life-time of the screen.