The National Geographic Magazine, Volume 85National Geographic Society, 1944 - Geography Indexes kept up to date with supplements. |
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Page 577
... Coal Now that brittle black log is shored up by true timbers . Special crews brace walls with posting and roofs with ... coal , " and coal itself comes from a widespread root mean- ing " black . " The English and Scots were the first to ...
... Coal Now that brittle black log is shored up by true timbers . Special crews brace walls with posting and roofs with ... coal , " and coal itself comes from a widespread root mean- ing " black . " The English and Scots were the first to ...
Page 578
... coal . Since then , by the use of coal , man has made iron his slave and by the use of iron has ruled the world . Coal and the Industrial Revolution It was not , however , until after the perfec- tion of the steam engine by James Watt that ...
... coal . Since then , by the use of coal , man has made iron his slave and by the use of iron has ruled the world . Coal and the Industrial Revolution It was not , however , until after the perfec- tion of the steam engine by James Watt that ...
Page 587
... coal mines there are explosions from the ignition of gas or coal dust , fires from spontaneous combustion , falls of roof strata , haulage and traffic acci- dents , falls down the shaft , and injuries from the use of explosives and ...
... coal mines there are explosions from the ignition of gas or coal dust , fires from spontaneous combustion , falls of roof strata , haulage and traffic acci- dents , falls down the shaft , and injuries from the use of explosives and ...
Contents
Brazils Potent Weapons By W ROBERT MOORE | 41 |
Dominican Republic Land of Plenty 11 illustrations in color from naturalcolor photo | 209 |
Frontline Town of Britains Siege Dover By HARVEY KLEMMER 105 | 225 |
Copyright | |
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