History has recorded a period of thousands of years, in which humanity illuminated the darkness with torch lights. The light is not bright,...
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History of Neon Lamps
On the highways of big cities in Indonesia and in our world a special light bulb. Generally called fluorescent lamps. The working principle...
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History of Steel Discovery
The iron ore excavated from the earth is still dirty. The ore is then destroyed in a casting furnace. But still there is dirt in it. It is ...
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History of Radio Discovery
The first sound transmitted via a wireless or radio device is an unclear, often disjointed voice. Therefore the sound or music can not be t...
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