Electrical news and engineering . g installation and if the alignment of bearings is not maintained if thereare accidental distortions or imperfect lubrication, the jour-nals become overheated and the fire risk is appreciably in-creased. With such an arrangement a large number ofbelts is necessary, the maintenance cost is high, and in ad-dition there is a tremendous friction loss in the transmissionsystem. These things naturally follow because a steam engine drive is nut and does not permit subdivisionof the machinery into small groups. Steam Drive and High Insurance Rates The ordina
Electrical news and engineering . g installation and if the alignment of bearings is not maintained if thereare accidental distortions or imperfect lubrication, the jour-nals become overheated and the fire risk is appreciably in-creased. With such an arrangement a large number ofbelts is necessary, the maintenance cost is high, and in ad-dition there is a tremendous friction loss in the transmissionsystem. These things naturally follow because a steam engine drive is nut and does not permit subdivisionof the machinery into small groups. Steam Drive and High Insurance Rates The ordinary steam engine drive makes it necessary tohave a boiler room dangerously close to the mill or else tohave heavy losses in long rope drives or steam mains. Un-less this boiler room is installed in a fireproof building theinsurance rating is increased—about 15 per cent in the caseof stone or brick mills, and about 50 per cent in the caseof frame buildings—above the rate for properly electrified. A 50 induction motor suspendedfrom ceiling—driving chop mill mills. The engine room, boiler room and main transmis-sions are all unnecessary in a modern electrified mill. In mills driven by water power the more evident dis-advantages are limited capacity, requiring sooner or later tobe supplemented by some other power, reduced capacityor possible shut down during the dry season due to lackof water, and in some cases similar trouble in flood seasonsdue to back w-ater in the trail race. In such mills the speedregulation is generally poor and the power losses in heavymain transmissions, the high maintenance costs of belts andropes and the difficulty of enlarging the mill have of these water-driven mills to adopt electric com-pleteK or as reserve for break-down service. Advantages of Electric Drive Where electric motors are used it is possible to dividethe machinery into groups and do away with the mainheavy transmissions. The fire danger is reduced becausethere are f
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