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| Ball and socket joint
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The type of joint usually used in a joystick allows free movement, in any angular direction, within the limits of the socket. This joint has a partial sphere on the end of a shaft, which moves within a closely fitting spherical socket. |
| Ball bearing
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A low-friction bearing type, with rotating parts, that has an inner and an outer race which are separated by steel spheres or balls, which give it its name. |
| Ball check valve
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A valve that uses a ball to seal against a seat to stop flow in one direction. |
| Ball cock assembly
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Mechanism in toilet tank that controls and regulates water levels by use of a ball shaped float, which will rise with the liquid, causing the valve to close by lifting a lever. |
| Ball joint
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The sphere shaped end of this flexible plumbing join rests in a socket. |
| Ball mill
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A paint mixing device consisting of a rotating drum containing metal balls. |
| Ball passage
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This refers to the size of the ball that can pass through the trapway of a toilet. This also relates to trapway size. In general, the trap size will be 1/8" larger than the maximum size ball that can pass through it. |
| Ball peen hammer
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Hammer consisting of one rounded end and one flat end on the hammer head and is used mostly for metal work. |
| Ball valve
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A valve that uses a ball to seal against the seat. |
| Ballast
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(1) Fluorescent lamp transformer which controls the starting and operating current by regulating current flow to the pins or sockets on the tube. (2) Stone or gravel, which provides drainage and stability, as a base for concrete. (3) Stabilizing weight added to ships. |
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