As the coke burning slower than the charcoal

As the coke burning slower than the charcoal, the time flashing arc also extended a lot. .later the French scientists Arc device fitted to a kind of clockwork, it can automatically adjust the distance between two carbon rods. so, the first official carbon arc lamp was born very. .1876, the Russian electrician Yabuluoqi can husband again had a larger reform of arc lamps. he removed the complexity of the watch body and magnet light adjustment device, and let the two carbon rods erected side by side, separated by a clay or plaster made of insulating film. He also used a device capable of changing current direction, so that two carbon rods alternately act as anode and cathode, so that the burning of two carbon rods on the same speed, but the distance between their ends can also remain unchanged the.
Because the erection of two side by side in the light of carbon rods, when, like a candle, it took them a good give it the name light sticks can last about two hours. .in the 19th century, after the age of 70 years, electric candle has prevailed. by the French Association of Investment made GE electric candle lights have been used as a support to light in the street, just a city of Paris with the thousands of support to electric candle, instead of the original streets of 70,000 kerosene so exciting heart of Paris has become a real city that never sleeps.