When the Coppock Curve gets down to a very low level and then turns up, it signals an important long term entry point. Coppock was a money manager who wanted to find the really great long term buy signals, and was not so much interested smaller swings.
It is inserted in the apparatus set-up between the reaction container and the gas collection system. It is packed with a solid water absorbing drying agent e.g. anhydrous calcium chloride (not for ammonia), calcium oxide (not acidic gases like sulphur dioxide, carbon dioxide and chlorine), anhydrous sodium sulphate.
  The formula for calcium carbonate, CaCO3, indicates that one molecule consists of a calcium atom, a carbon atom, and three oxygen atoms.o that would require making an anion out of carbon and oxygen. The only polyatomic anion that you can get from carbon and oxygen is carbonate, CO32-. So the calcium carbon oxygen that you might be referring to is calcium carbonate, CaCO3.