A mine worker wet-drilling at a stope of a copper mine in Butte, Montana. Water is sprayed from drills onto stope walls that makes sludge of the cutting and prevents dust.
Square Set Timbering is seen inside a stope at a copper mine in Butte, Montana. Timber logs provide a support to the soft and broken rock adjoining the veins of the ore. Mine workers drill inside a stope. Timber placed in square set fashion can be seen.
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.
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.
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.
Describes raw materials used in telephone manufacturing. The map shows location of China. Silk worms are taken from mulberry trees in China. Worms are sorted and placed in a nest of thorns to weave cocoons. Cocoons are picked up from the nest. Man shows a box containing various samples of silk. Animation shows the use of silk as an insulator inside a telephone.
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