")
This operation fine example the nineteenth
century confidence economies scale. expected cut costs by
exploiting the rich ores the newly discovered Mesabi range
of Minnesota. The rock passed through several
sets rolls until was graded finely enough dried and
then taken the separation phase. (See Sidebar "Edison and
the Boys Work.
The great work building the Ogden plant continued
. Edison thought he
could produce ore cheaper processing more it. Here was passed through
Edison's "three high" rolls which produced finer powder out
of the crushed ore which could then separated hundreds of
successively more powerful magnets. the other hand, Edison confidently expected
that could deliver ore the eastern blast furnaces cheaper
than ore from the midwest, and that the low price his output
would enable the eastern furnaces compete with Carnegie's
steel mills. These machines were designed the West
Orange laboratory and were probably the largest ever built,
each weighing thirty-five tons. Carnegie's
strategy was based the proximity the ore beds his
mills the Great Lakes. Similarly,
Andrew Carnegie and Henry Frick were confident that their giant
steel works (another trademark the Second Industrial
Revolution) would drive down costs integrating all steps of
steel manufacture into one large organization.VI-24
was done giant cornish rolls which crushed the rocks they
fell between them
