Chemical that protects from deterioration, rot or infestation of materials, such as wood. Copper napthenate and pentachlorophenol are commonly used as preservative for wood that is exposed to such conditions.
Zoning designation covering a sensitive environmental area, parkland, scenic area or historic district, and placing especially strict limitations on private landowners' and nonowners' freedom to change the essential character of sites within the district.
Oxyfuel welding process, which can be used in automated welding operations, which heats the surface to the proper temperature and then fuses the parts under sufficient pressure, without use of filler metal.
Use of stretching steel cables, in a concrete form, so that tension is put on them prior to the placement of concrete. Even after the concrete has set and hardened, the steel stays in tension, to add to the concrete strength.