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• Phonograph
  ...ested in the late 1870s and early 1880s. The oldest surviving example is a copper [[Electrotyping|electrotype]] of a recording cut into a wax disc in 1881. T ...dles. The most common material was steel, although other materials such as copper, [[tungsten]], bamboo and cactus were used. Steel needles needed to be repl
  115 KB (17,286 words) - 16:32, 16 December 2018
• Expansion tectonics
  ...rthCopperSilverGold.jpg|thumbnail|450px|Figure 21 Distribution of orogenic copper, silver, molybdenum, and gold plotted on the Permian small Earth model. Dat
  100 KB (15,176 words) - 13:13, 4 December 2018
• Incandescent light bulb
  ...e book |last=Blake-Coleman |first=B. C. (Barrie Charles) |year=1992 |title=Copper Wire and Electrical Conductors – The Shaping of a Technology |url=https:/
  104 KB (15,285 words) - 16:44, 16 December 2018
• Thomas Edison
  ...ts to an economically manageable size and using the necessary thickness of copper wire, he would have to develop a lamp that used a low amount of current. Th
  105 KB (15,290 words) - 17:19, 16 December 2018

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