Fire extinguishing equipment is a kind of fire-fighting must-haves that are often ignored by people and show their skills when they are urgently needed. Especially in the high-rise buildings, the interior is decorated with a lot of wood, plastic, and fabrics. Once there is a fire, without proper fire extinguishing equipment, it may cause catastrophe.
The ancient fire extinguishers were very simple, nothing more than hooks, axes, shovels, buckets and the like. The first real special fire extinguisher was invented by the British captain and Norfolk Manby in 1816. It was just one or two drums filled with more than 1 liter of water and filled with compressed air.
By the middle of the 19th century, French physician Gallier had invented a portable chemical fire extinguisher. Mix the sodium bicarbonate and water in the barrel, and place a glass bottle with sulfuric acid in the barrel mouth. When in use, the firing pin pierces the bottle to mix the chemical substances, produce carbon dioxide, and press the water out of the barrel.
In 1905, Professor Laurent of Russia invented a foam fire extinguishing agent in St. Petersburg, mixing aluminum sulfate with sodium bicarbonate solution and adding a stabilizer. After spraying, a foam containing carbon dioxide is formed, which floats in burning oil, paint or gasoline. It can effectively isolate oxygen and suffocate the flame.
In 1909, Davidson of New York obtained a patent for using carbon dioxide to press out carbon tetrachloride from a fire extinguisher. This liquid would immediately become a non-flammable heavier gas to smother the flame. Since then, a variety of small fire extinguishers such as dry powder fire extinguishers and liquid carbon dioxide fire extinguishers have appeared.
