. Transactions . rly simple. The workbeing done by motor or generator at any instant can be read directlyfrom a scale and, if desired, automatically recorded. If necessary,motors can be controlled from a distance without difficulty. The prime source of power is first to be considered. By cover-sion into electrical energy, water-power, even at a considerable dis-stance from the mine or mill, can be made valuable for all purposes,and steam power can be so located as to secure fuel and watercheaply. In addition to this, one large engine costs less, is moreevenly loaded, requires less attendance,
. Transactions . rly simple. The workbeing done by motor or generator at any instant can be read directlyfrom a scale and, if desired, automatically recorded. If necessary,motors can be controlled from a distance without difficulty. The prime source of power is first to be considered. By cover-sion into electrical energy, water-power, even at a considerable dis-stance from the mine or mill, can be made valuable for all purposes,and steam power can be so located as to secure fuel and watercheaply. In addition to this, one large engine costs less, is moreevenly loaded, requires less attendance, and is necessarily more effi-cient than a number of small ones. The introduction of electricityhas in this way made important reductions in the cost of power,and there are cases in which it would be impossible to run withoutits help. An example is furnished by the Viry^inius Mine at Ouray,Colo., to which 300 horse-power is carried at 800 volts from awater-power four miles distant. The cost of coal at the mine was.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
