1. the great circle on a sphere or heavenly body whose plane is perpendicular to the axis and everywhere equidistant from the poles. 2. the great circle of the earth that is equidistant from the North Pole and South Pole. 3. a circle separating a surface into two congruent parts. 4. celestial equator. [1350â1400; Middle English < Medieval Latin aequÄtor, Latin: equalizer (of day and night, as when the sun crosses the equator).
For potable water use, galvanized iron piping was commonplace in the United States from the late 1800s until around 1960. After that period, copper piping took over, first soft copper with flared fittings, then with rigid copper tubing utilizing soldered fittings.oday, most plumbing supply pipe is made out of steel, copper, and plastic; most waste (also known as soil) out of steel, copper, plastic, and cast iron. The straight sections of plumbing systems are called pipes or tubes. A pipe is typically formed via casting or welding, whereas a tube is made through extrusion.
Who discovered Copper? Copper is a metal which was known to people even during the pre historic times. Due to this reason we cannot say who discovered copper but evidence found by archaeologists propose that people living between the 5000 BC and 1200 BC may have discovered the metal. It was used by the ancients for making utensils, jewelery and weapons. Some historians consider that Romans were the first to use the metal on a large scale, some 11,000 years ago. Historians have also found evidence that copper was used in ancient India for making coins, lamps, idols and utensils.