The elimination or reduction of a condition. Diminishing in strength. Decreasing of strength of a timber as it is shaped to the proper size for use. Wastage of wood when lumber is planed to size. Shaping of metal by hammering.
Material used for grinding, sanding, polishing or the wearing away of another material. Aluminum oxide, garnet and silicon-based compounds are commonly used as abrasives for sanding and smoothing wood.
Strips of material impregnated with an abrasive that are attached to a hub with a shank. When the shank is inserted into the chuck of a power drill, the spinning strips can be used to sand irregular surfaces.
Value that won't change when other factors change, such as a constant in a mathematical equation. Something that is free from imperfection. Unconditional, without restriction, such as the power of a dictator. An exact amount.
A field engineered to receive septic tank effluent. Also called a leeching or seeping field, an absorption field consists of a series of shallow trenches - parallel, round, or whatever the land allows - 18" to 24" wide, in which drain tiles (pieces of perforated pipe) are placed. If the permeability of the soil, established by a percolation test is exceptional, then the pipes can be laid directly on it. In most cases the trenches must be lined with a 6" layer of gravel to help the effluent absorb properly into the soil.