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| Lead masonry
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Section of wall, which is built up and racked back for successive courses with a stretch line to the leads to guide the construction between them. |
| Lead oxide
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Once used as a paint pigment or rust preventative, this combination of lead and oxygen is no longer popular. |
| Lead wood
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Fine mesh steel, which is used to plug enlarged screw holes. The screw is turned and becomes enmeshed with the mesh, which grips the soft compressed mass, filling the space. |
| Leaded zinc
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Formerly used for rust prevention, this combination of zinc oxide and lead sulfates, is no longer popular. |
| Leader
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Pipe carrying rainwater from gutters to the ground or sewers. |
| Leader head
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A component used to direct water from a through-wall scupper to a downspout. Also known as a Collector Head. |
| Leader pipe
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A conduit for carrying water from a gutter, scupper, drop outlet or other drainage unit from roof to ground level. Also known as Downspout. |
| Leading edge
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In reference to a wind energy conversion system, the area of a turbine blade surface that first comes into contact with the wind. |
| Leading end
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The leading end is that part of a workpiece that is pushed into the cutting tool's in-feed. |
| Leaf mold
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Partially decayed leaves used in some potting mixtures. It must be sieved and sterilized before use. Great for outdoor use in beds. |
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