'The story of rock drilling ' about the various types of drills and bits used for drilling into rocks in the United States. An iron mine in northern New York. A diamond ore drill being used to explore rock samples. A man works on the drill. Men work on hollow drill rods with core along the lines of the rod. Men place the drill rods in a box in a sequence.
The various types of drills and bits used for drilling into rocks in the United States. An iron mine in northern New York. Men work on rocks in 40 to 100 feet deep mines. Rotators or automatic hammers being used to cut into rocks by a man. The rotators being operated by a hand as they drill into an ore bench in a mine. A man operates a hand rotator to break a large rock fragment.
The various types of drills and bits used for drilling into rocks in the United States. An iron mine in northern New York. Men in a mine use a heavy hammer drill to dig out holes in rocks. A workers fills explosives in the holes. Fuses of the explosives being lit up. The extracted ore being transported in cars. A Corliss hoist in operation.
The various types of drills and bits used for drilling into rocks in the United States. A Corliss air compressor that furnishes air power for rock drilling. Men in a mine in northern Michigan as they work with rotator hammers to sink a shaft 1700 feet below the surface. Six workers drill with rotators. A worker drills into the wall and roof of the mine. An auger rotator being used to drill into a soft ore bench.
The various types of drills and bits used for drilling into rocks in the United States. Men work on a drill steel heating furnace and sharpener as they prepare the drill steel by repeated hammer blows. The drill steel being hammered repeatedly. A man inserts a sharpener into the steel as they prepare it for auger drill.
Aerial views taken from a biplane at several altitudes over American battleships and other U.S. Navy ships off the west coast of the United States. Guy wires of aircraft wings clearly visible. Low altitude flyby (in order) of the Battleships USS Nevada (BB-36), USS Arizona (BB-39) and USS Idaho (BB-42), then the USS California (BB-44) and USS Pennsylvania (BB-38).
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