The Encyclopedia Americana: A Library of Universal Knowledge, Količina 7Americana corporation, 1931 |
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Stran 152
... machine mined . In Europe , where coal mining by machines had its origin , the development has been slower . In Great Britain less than 10 per cent of the coal output is mined by machines . In the United States the practice has been to ...
... machine mined . In Europe , where coal mining by machines had its origin , the development has been slower . In Great Britain less than 10 per cent of the coal output is mined by machines . In the United States the practice has been to ...
Stran 154
... machine * in Fig . 7 is a short - wall machine and is shown loaded on its truck for transportation . At work it slides on the floor and is moved about by its own windlass and chain . Bar machines have about the same capacity as disc ...
... machine * in Fig . 7 is a short - wall machine and is shown loaded on its truck for transportation . At work it slides on the floor and is moved about by its own windlass and chain . Bar machines have about the same capacity as disc ...
Stran 156
... machine is ready to widen out a room ; ( m ) cutting along the side ; ( n ) moving and loading the machine on its truck . The above illustrations show the ease with which the short - wall machines are manipulated . Short - wall machines ...
... machine is ready to widen out a room ; ( m ) cutting along the side ; ( n ) moving and loading the machine on its truck . The above illustrations show the ease with which the short - wall machines are manipulated . Short - wall machines ...
Vsebina
PALMER WALTER | 128 |
PICKERING WILLIAM | 285 |
SEE THOMAS J J Ph D | 361 |
Avtorske pravice | |
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