four-ball tester

[¦fȯr ¦bȯl ′tes·tər]

(engineering)

A machine designed to measure the efficiency of lubricants by driving one ball against three stationary balls clamped together in a cup filled with the lubricant; performance is evaluated by measuring wear-scar diameters on the stationary balls.

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Fouquet, Nicolas
Fouquier-Tinville
Fouquier-Tinville, Antoine Quentin
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Four-color process
Four-color process
Four-color process
four-color separation process
four-colour
four-colour glossies
Four-colour printing
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