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| Back filling
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Brickwork used between structural members or covering the outside curved surface of an arch. |
| Back flow
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The circumstance of water traveling from one system back into any part of the main distribution system, usually by siphoning. |
| Back flow preventer
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A device to prevent backflow, esp. into a potable water supply. This is generally required for sprinkler systems, handheld showers, pullout faucet spouts, kitchen sprayers, etc. |
| Back gouging
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Removal of a substance from the back side of a weld. |
| Back hearth
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Floor portion of a fireplace combustion chamber. |
| Back pressure
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Pressure that resists the flow of fluid in a piping system. |
| Back primed
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When a coat of paint is applied to the back of woodwork and exterior siding to prevent moisture from entering the wood and causing the grain to swell. |
| Back rake
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Measurement of the angle at the top cutting edge of a lathe tool bit from the horizontal axis of the tool. |
| Back saw
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Used alone, the back saw is the tool of choice for creating straight cuts. Combined with the miter box, it provides a quick and accurate way of making straight cuts and the angled cuts commonly known as miters and bevels. The back saw and miter box are required tools for creating tight fits between pieces of trim and molding. |
| Back siphonage
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The negative pressure that permits fluids to flow to into the system of a potable water system. |
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