William D. Coolidge
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William David Coolidge was an American physicist and engineer, who made major contributions to X-ray machines. He was the director of the General Electric Research Laboratory and a vice-president of t
Dr. W.D. Coolidge LCCN2014714233
Tungsten
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Tungsten is a chemical element; it has symbol W and atomic number 74. It is a metal found naturally on Earth almost exclusively in compounds with other elements. It was identified as a distinct elemen
William D. Coolidge
…the director of the General Electric Research Laboratory and a vice-president of the corporation. He was also famous for the development of "ductile tungsten", which is important for the incandescent light bulb. Coolidge was born on 23 October 1873 on a farm near Hudson, Middlesex County, Massachusetts, the…
Wolfram evaporated crystals and 1cm 3 cube
Tungsten rod with oxidised surface
Wolframite mineral, with a scale in cm
Tungsten mining in Rwanda forms an important part of the country's economy.