The World Book Encyclopedia, Tom 4World Book, 1994 - 666 An encyclopedia designed especially to meet the needs of elementary, junior high, and senior high school students. |
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Strona 724
... machine , left , cuts a deep slit along the base of the coal face ( coal exposed on the surface of a mine wall ) . Another machine , center , drills holes into the face . Miners load the holes with explosives and then set the explosives ...
... machine , left , cuts a deep slit along the base of the coal face ( coal exposed on the surface of a mine wall ) . Another machine , center , drills holes into the face . Miners load the holes with explosives and then set the explosives ...
Strona 725
... machine that resembles a chain saw cuts a long , deep slit , usually along the base of the coal face . ( 2 ) Another machine drills a number of holes into the face . ( 3 ) Each hole is loaded with explosives . The explosives are set off ...
... machine that resembles a chain saw cuts a long , deep slit , usually along the base of the coal face . ( 2 ) Another machine drills a number of holes into the face . ( 3 ) Each hole is loaded with explosives . The explosives are set off ...
Strona 1046
... machine does not use photographic film to make a negative . Instead , it projects light reflected from the original directly onto light - sensitive paper . De- veloping the paper produces the copy . The photostat machine , like any ...
... machine does not use photographic film to make a negative . Instead , it projects light reflected from the original directly onto light - sensitive paper . De- veloping the paper produces the copy . The photostat machine , like any ...
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