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| Leaching
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The removal or loss of excess salts or nutrients from soil. The soil around over fertilized plants can be leached clean by large quantities of fresh water used to 'wash' the soil. Areas of extremely high rainfall sometimes lose the nutrients from the soil by natural leaching. |
| Leaching bed
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A system of trenches that carries wastes from sewers. It is constructed in sandy soils or in earth filled with stones. Or gravel. |
| Lead
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(1) An electrical wire, which carries current from one point to another in a circuit or to or from a piece of apparatus. (2) The linear distance moved by a threaded object in one rotation. (3) Built-up masonry wall section, from which other courses are stepped back successively. (4) Dense, soft metallic element; atomic symbol Pb, atomic number 82, atomic weight 207.19. This metallic chemical found can be found in paint and plumbing in older dwellings and is a health risk. |
| Lead acid battery
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An electrochemical battery that uses lead and lead oxide for electrodes and sulfuric acid for the electrolyte. |
| Lead carbonate
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Poisonous salt once used as white pigment in paint. |
| Lead drier
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An acid, used for drying, which is made from lead and was once used in paint. |
| Lead expansion anchor
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Used to anchor an item in place, this lead sleeve is open lengthwise and threaded on the interior. The sleeve is placed into an opening and the screw is tightened into the sleeve, which forces the sleeve against the sides of the hole, expanding it and holding it in place. |
| Lead joint or lead and oakum joint
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Bell and spigot drainage pipe joint of case iron where molten lead is poured over a coarse, untwisted rope of hemp that is in the joint, sealing it. |
| 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. |
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