Porous soiled area, through which septic tank leach lines run, emptying out the treated liquid waste, forced from the tank, which then percolates down through the soil.
Leach lines
Lines that carry effluent from the septic system out to the leach fields where, when new sewage is added to the tank, it empties into the area of porous soil.
Leaching
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
A system of trenches that carries wastes from sewers. It is constructed in sandy soils or in earth filled with stones. Or gravel.
Lead
(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
An electrochemical battery that uses lead and lead oxide for electrodes and sulfuric acid for the electrolyte.
Lead carbonate
Poisonous salt once used as white pigment in paint.
Lead drier
An acid, used for drying, which is made from lead and was once used in paint.
Lead expansion anchor
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
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.
