Headlights of the incandescent lamp
Tungsten has many salient features, it is higher than the melting point of any other metal element
Finally in the ninth year of the twentieth century
People seeking the ideal state of the filament is spare no effort.
In fact, before the birth of charcoal incandescent, people try to use a variety of refractory metal filament, and after the advent of incandescent
Incandescent lamp glory enjoys popular support, there have been a large number of inventors to join the incandescent improvement business
