The incandescent bulb is the earliest mature artificial electric light source, which is based on the principle that the filament is energized and heated to emit light. In general, incandescent bulbs have lower luminous efficiency and shorter life, but are more convenient to use.
Incandescent bulbs Humans have used incandescent bulbs for 128 years. When it comes to incandescent lamps, everyone naturally thinks of the great inventor Edison. He tried more than 6,000 materials to find the material of incandescent filaments, and finally tested it with carbon filaments. The first true incandescent lamp, after 45 hours of use, the filament was blown. Later, after continuous improvement by Edison and the latecomers, the incandescent lamp had a life of more than 3,000 hours today.
Langmuir's research on the interaction between gas and metal surfaces makes the practical application of incandescent lamps a reality. GE's renowned scientists, William Coolidge and Irving Langmuir, perfected the tough tungsten metal manufacturing technology for incandescent bulbs, winding them into filaments to reduce heat loss, and preventing the bulb from blacking by using inert gases. It is the research on materials that made incandescent lamps come out, and also created the use of materials science and engineering in the industry.
Edison invented incandescent lamps and made great contributions to the development of human civilization, bringing light to mankind. However, compared with today's fluorescent energy-saving lamps and LED energy-saving lamps, incandescent lamps have lower luminous efficiency, lower luminous efficiency, shorter thermal life and safety, and can not be compared with fluorescent energy-saving lamps and LED lamps. While thanking Edison, we had to let the incandescent lamp he invented to go down the historical stage in order to save energy and protect the environment.
Gate Valves are called "full-flow" valves; there's a direct unobstructed path for flow right through the middle of the valve. A wedge-shaped brass gate is lowered into a machined slot to close the valve. They should either be completely open or completely closed. Water flowing through a partially open gate valve wears away the metal and causes the valve to fail over time.
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