Smithsonian Contributions to KnowledgeSmithsonian Institution, 1863 - 151 páginas |
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... Copper Falls Vein . 9 Figure 4 . Figure 5 . Stone Hammer or Maul , with one groove , and broken by use - Copper Falls Mine . Copper Spear - head - Copper Falls Mine 11 11 Figure 6 . Central Mine . Section of the vein and old pit . East ...
... Copper Falls Vein . 9 Figure 4 . Figure 5 . Stone Hammer or Maul , with one groove , and broken by use - Copper Falls Mine . Copper Spear - head - Copper Falls Mine 11 11 Figure 6 . Central Mine . Section of the vein and old pit . East ...
Página 1
... copper , and even use the term mines , it is clear , from the general tenor of their narratives , that they neither saw nor knew of any actual mining in the technical sense of that word . They announced as early as the year 1636 the ...
... copper , and even use the term mines , it is clear , from the general tenor of their narratives , that they neither saw nor knew of any actual mining in the technical sense of that word . They announced as early as the year 1636 the ...
Página 2
... copper are well calculated to resist the severe attrition to which transported materials are subjected . Masses of it have been found not far removed from the mineral range , weighing 3000 lbs . , and others at a greater distance have ...
... copper are well calculated to resist the severe attrition to which transported materials are subjected . Masses of it have been found not far removed from the mineral range , weighing 3000 lbs . , and others at a greater distance have ...
Página 3
... copper boulders , and could as easily have done so in regard to mines , if any such had really existed . If the Chippeways had been cognizant of the ancient works that have been recently discovered , they would have communicated this ...
... copper boulders , and could as easily have done so in regard to mines , if any such had really existed . If the Chippeways had been cognizant of the ancient works that have been recently discovered , they would have communicated this ...
Página 4
... copper , but exclu- sively as native metal . This is met with in immense masses , in veins of smaller size , and in rounded nodules . The cutting of the masses is a tedious and costly process , and in some instances , even with all the ...
... copper , but exclu- sively as native metal . This is met with in immense masses , in veins of smaller size , and in rounded nodules . The cutting of the masses is a tedious and costly process , and in some instances , even with all the ...
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annual variation April May June aurora b c m Baffin Bay Bellot Straits bi-hourly bifilar bm z 66 BOARD THE YACHT Calm 1 N. E. Calm Calm Calm copper curves Dawn at 7h deflection diagram difference Dip reduced Dip when loaded disturbances diurnal variation Div's dovekies dusk at 4h epoch Fahr fathoms February March April feet Girard College horizontal force Hour angle hourly January February March July August Latitude lunar lunar effect Lunitidal interval magnetic declination maxima and minima maximum Mean Lat Midn't midnight minimum month monthly mean moon Moon's N. W. by N Needle Noon Philadelphia Port Kennedy readings Referred mean Relative total intensity Rensselaer Harbor scale divisions seen summer Temp temperature Toronto values W. N. W. Calm weight wind winter YACHT FOX ос