Electric light by the first practical electric arc light in 1806. By the 1870s, Davy's arc lamp had been successfully commercialized, and was used to light many public spaces. The development of a steadily glowing filament suitable for interior lighting took longer, but by the early twentieth century inventors had successfully developed options, replacing the arc light with incandescents. The energy efficiency of electric lighting has increased radically since the first demonstration of arc lamps and the incandescent light bulb of the 19th century. Modern electric light sources come in a profusion of types and sizes adapted to many applications. Most modern
Canadian Crude Index futures contracts: A fixed price contract, which represents the price of crude oil at Cushing, Oklahoma, and a basis differential contract, which represents the difference in price between Cushing and Canada. Both contracts are priced in U.S. dollars per barrel. Together, these create a fixed price for Canadian crude oil. The Index value is determined by its third-party calculation and publication agent, the NYSE Global Index Group, based on daily returns of prices published by ICE Futures Europe. Canadian Crude Index The Canadian Crude Oil Index (CCI) serves as a benchmark for oil produced in Canada. It allows investors to