What Is a Safelight?

Safety lights are lamps used in mines to prevent the explosion of mixed gas. There is a copper wire cover on the lamp to dissipate the heat around the flame. According to its flame changes, the toxic content of the gas in the mine can be estimated. Broadly refers to lighting appliances with a voltage below 36 volts or with safety equipment.

Safelight is also called safety light. versus

David invented the safety light

In 1814, Professor Humphrey David of the Royal Research Institute invented a safety light for miners. David is an outstanding chemist who has studied various gases. Gas will explode as soon as it meets an open flame, which is an extremely dangerous gas for miners. Therefore, he installed the lamp with a copper wire cover to absorb the heat around the flame and prevent the open flame from directly contacting the outside air.

However, only an open flame lamp is truly safe. As early as 1811, Sir David connected two carbon electrode conductors with large cross-sections on each pole of the power supply, and a very strong electric spark was generated between the conductors. This is the arc. As a result, David made the first flameless egg-shaped arc lamp and revealed the brightness characteristics of the arc. This kind of lamp has only been tested.

In 1847, based on the David arc lamp, the British Stant produced the first practical arc lamp. In 1848, another Englishman Petrie improved it. In 1848, French physicist L. Foucault adjusted the arc lamp. Start and Petrie's arc lamps have a shorter life. To solve this problem, many inventors started hard research work.

In 1872, the Russian Paul Nikolavich Yablokov made radical improvements to the arc lamps in order to install lighting equipment for the railway. . It consists of two parallel carbon rods. The carbon rod is fixed in the insulating material and connected to the battery two stages respectively, exposing only the top end. When AC power is applied, the electrodes are gradually consumed and the insulating material used is slowly melting (like a real candle). As long as the distance between the electrodes is constant, the arc will continue to occur. This invention can be used to illuminate some public places. But it was not until the invention of incandescent lamps that public electrical lighting developed rapidly.

Stephen Sun invents safety light

The Industrial Revolution promoted the rapid development of British industry, and the development of industry caused a sharp increase in the demand for coal. However, at the time, explosions in coal mines were also endless, and miners were injured and injured. Miners who were pursuing profits were afraid of being condemned by the public Efforts to cover up the truth of the explosion and prevent the spread of such news. However, the facts cannot be covered. Large explosions have occurred in various mines in the north of the UK, which has caused great concern from all walks of life. British charity The organization's "Mine Accident Prevention Association" invited chemist Humphrey David to study the causes of explosions in coal mines and the methods to prevent them. David researched and experimented and invented coal mine safety lights. The lights are equipped with " The "screens that confine the flames" and "wind screens" can reduce the temperature of such mixtures by allowing gas, air, and light to pass, so the flames cannot go out of the screens; the latter is to prevent excessive wind to ensure safety .

In November 1815, David published a paper at the Royal Society of London, discussing flammable gas and lighting improvement methods in the mine to prevent explosions. In 1816, the safety lamp developed by David was officially launched, and after the miner tried it, the effect was good. Just While David was nervously researching safety lights in London, Stephen Sun also experimented with another type of safety lights at home. Stephen Sun worked at the Canlinworth Coal Mine for decades. Fires and explosions caused by open flames in the mines. He witnessed every A tragic incident, determined to improve open flame lighting to prevent explosions.

In December 1815, Stephen Sun gave a speech at the Newman's Philosophy, announcing the safety lights he studied. Stephen Sun believes that "as soon as the burning air blows into the flame, the fire will extinguish. If the gas moves at a faster speed and generates reverse airflow, the flame can be prevented from moving. "The safety lamp made by Stephen Sun, the air flows in through a small circular hole on the side wall of the oil container, and then flows through the small hole Introduced the air between the two boards, and finally led to the flame through a series of small holes. At the Wenzhe, Stephen Sun's friend Wood acted as an interpreter, and Stephen Sun stood aside when he discovered that Wood's explanation was subtle. When he made a mistake, he immediately gave a detailed and accurate explanation. He collected a lot of hydrogen from the mine, and ignited his lamp with fire, proving that the lamp was safe. Later, when David's safety lamp was brought to Newsee for exhibition, many Everyone thinks that this lamp is exactly the same as that made by Stephen Sun. David's safety lamp has been praised by the country and received the highest praise. He received a reward of 2000 pounds, while Stephen Sun only received a prize of 100 pounds. Familiar. Stephenson's artificial They were upset that they believed that Stephen Sun invented the safety light before David, and that it was not fair to deal with Stephen Sun, so there was a controversy about the safety light. Although Stephen Sun publicly announced the date of the safety light at the New Jersey Wenzhe After David, but people can prove that Stephen Sun had made his safety light long before David invented the safety light. From 1816 to 1817, the local press reported the dispute in many ways. Wei thinks that Stephen Sun plagiarized his invention. Stephen Sun was not a coward, but he always remained calm and indifferent. Stephen Sun asked his friends to write a word for the Journal of Philosophy on March 13, 1817 A prudent letter, saying: "The last issue of your magazine seems to think that my conception of safety lamps and apertures was derived from Sir David's research. Obviously you have not seen my public statement. Otherwise, I will not be doubted. Integrity.

In fact, the principle of this safety light was already understood and applied in this mine long before Sir David started to research. The production plan and facts of this light can be proved by the manufacturer, and it was always in Before Sir intends to solve the problem "Nicholas Wood was very familiar with his friend Stephen Sun. He knew the production process of safety lights. He wrote articles in newspapers, published documents, letters, introduced the process of Stephen Sun's development of safety lights, and fully supported friends. Preside justice for Stephen Sun. The Great Alliance also calls for innocence for Stephen Sun.

On November 1, 1817, a conference was held in the New York City Hall. The meeting published the entire process of Stephen Sun's development of safety lights. The tinsmith Hoger proved that on October 7, 1815, Stephen Sun brought his design drawings to the store and asked him to make them. Safety light; many miners have proven that this light has been tested in the mine as early as August. Stephenson's son Rob and friend Wood have participated in the development work to bring dangerous gases home. Gas reactions occurred during the test. Ignited, but did not explode. Stephen Sun's improved safety light was completed on November 4th. The actual application in the mine was the third modified light on November 24th, which was officially announced in Wenzhe in December. At the meeting, the General Assembly believed that Stephen Sun had no possibility of plagiarizing David's achievements. He believed that Stephen Sun deserves the same reward. Therefore, Stephen Sun was awarded 1,000 pounds and a silver commemorative cup. The silver cup was engraved with "the first one to use the principle of safety lights The conference gave Stephen Sun the respect and status he deserved. Ten days after the report of the conference, David wrote to the conference committee that he believed that Stephen Sun had deceived the conference committee and violated his honor. David did not believe that Stephenson, a poor and chemically motivated worker, would invent a safety light until his death. The safety light dispute continued until a committee of the House of Commons of the British Parliament came to mediation in 1883. The commission announced that George Stephenson's invention proved to be false. "George actually clarified the principles of safety light manufacturing before the famous scientist David", and the honor should be shared. In the coming decades, coal mines in northeast England continued Use the safety light invented by Stephen Sun, and the other mines use the safety light of David. The safety light designed by David, because its lamp head part is easy to heat,

An explosion in the Ritz mine in 1825 killed 24 people. Stephenson's safety lamp, the inner flame surrounded by a glass seat, never overheated. The story of this invention dispute is only a mysterious coincidence in history One of the incidents, Stephen Sun was involved in this dispute over safety lights, prompting him to move more firmly towards a scientific cause that can change the world. ^[1]

Anti-glare, dust-proof, waterproof, anti-corrosion, shock-proof.
Chemical toughened high light transmission glass, no secondary light pollution, no secondary glare, no secondary light reflection, high strength, high temperature resistance, high purity, high purity and high efficiency anode reflector, better light distribution
Using protection corner design and

It is suitable for flood-lit lighting of roads in factories, platforms and various large facilities, stadiums, tunnels, railways and bridges. ^[2]