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| Niello
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A black alloy used as a decorative inlay in metal surfaces. Made from silver, lead, copper, and sulfur. |
| Night seal
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A temporary sheet covering of synthetic, waterproof material used to cover an opening in a roof until construction is complete. |
| Nineteen-inch selvage
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Also referred to as wide selvage asphalt or SIS, this asphalt roofing has a 17 inch granulated surface and 19 inch non-granulated. |
| Ninety-pound
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Granule-surfaced or fiber glass or organic felt roll roofing that has a mass of approximately 90 pounds per 100 square feet. |
| Nippers
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Wire cutters. |
| Nipple
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A short length of pipe installed between couplings or other fittings. |
| Nipple extractor
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A tool used to unscrew sections of pipe. |
| Nipple extractor
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A tool used to unscrew sections of pipe. |
| Nitrogen cycle
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The transformation of nitrogen from an atmospheric gas to organic compounds in the soil, then to compounds in plants and eventually the release of nitrogen gas back into the atmosphere. |
| Nitrogen dioxide
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This compound of nitrogen and oxygen is formed by the oxidation of nitric oxide (NO) which is produced by the combustion of solid fuels. |
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