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China 1928 stock footage and images
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Copper ore mined and copper metal extracted at a copper mine in Montana, United States.
Documentary titled 'The Inside Story of Your Telephone'. Describes raw materials used in telephone manufacturing. Dynamite crew places dynamite at a copper mine in Montana, United States. Miners shovel the blasted ore onto ore cars. Ore is loaded into converters. Slag is poured off. Stacked bars of pure electrolytic copper. Picture of a telephone made of copper.
American women workers punch mica into strips and washers.
Describes raw materials used in telephone manufacturing. The map of India is shown. Women workers in America punch mica into strips and washers that insulates a telephone's transmitter. Animation shows the use of mica inside a telephone's transmitter.
Cotton is picked and bailed in United States.
Describes raw materials used in telephone manufacturing. Women pick cotton at a cotton farm in United States. Bales of cotton taken on hand carts. Animation shows the use of cotton thread inside a telephone's transmitter.
Gold mining in British Columbia.
Describes raw materials used in telephone manufacturing. The map shows a location of British Columbia. Animation shows mining of gold through tunneling in a mountain. Gold ore mined inside a gold mine in British Columbia. Gold is smelted and poured into molds for casting slabs.
Silver crushed, smelted and casted into bars at silver mine in Queretaro, Mexico.
Describes raw materials used in telephone manufacturing. The map shows a location of Queretaro in Mexico. Workers collect molten silver pouring from a huge bowl at a smelter. Silver ore is crushed in a huge stone crusher. Workers load ore bags on their backs. Workers stack slabs of silver.
Platinum is mined and mixed with silver and gold to produce alloy, Russia.
Describes raw materials used in telephone manufacturing. The map shows a location of Russia. Platinum mined in the dredges of Ural Mountain streams. Hand examines crushed platinum ore in a bowl. Mixture of silver, gold and platinum is melted and poured into mold. The resultant alloy bar is placed between samples of gold, silver and platinum on a table. Animation shows use of the alloy in a telephone instrument.
