Identifier: electricalnewsen31donm (find matches)
Title: Electrical news and engineering
Year: 1891 (1890s)
Authors:
Subjects: Electrical engineering
Publisher: Don Mills, Ont. (etc.) Southam-Maclean Publications
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

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n. There was a three hourstop to pump water out of the ventilating air duct for thereversing motor on starting up at the beginning of a weeksrun. This air duct was afterward water proofed as it wasfound that continued wet weather would saturate the soilenough to soak through the concrete duel. Greater Tonnage Obtained .Although the engineer on the old drive is riow the motoroperator on the blooming miI, it I as been found that it re- in this as in other plants, ore bridges are extensivelyused to convej- ore and stone frorti boat or trough to stockpiles and bins. In the smaller plants a single unit is in-stalled, hence reliability is important. Direct-current mo-tors are almost always used for ore bridges and unloaders.Their principal points of advantage are as follows:— ( I ) .Accurate dynamic braking control can be obtainedon the hoist motion with greatest simplicity. Ci) The motors required for hoist and trolley motionscan be consiLlei :i!ily lighter, due to the high starting tor-
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operated tilting, travelling roller tablesAlgoma Steel Corporation quires a man much less skilled than with the engine, and thequestion of having a man to take the engineers place in hisabsence is not so vital as formerly. In fact there is beinginstalled a foot-operated master controller which will beworked by the roller, and cut out one man from the pulpitcrew. With the motor the speed is practically constant, andthere is no danger of overspeedin.g, even if the operator doesnot move his lever. The fatigue of the operator is also afactor, for the difference between pulling the engine leverand the electrical controller is quite marked. Many Advantages With electric drive, the losses stop when the turn isover. .\t the opening of the switch the consumption ofenergy ceases. How different this is from the steam line,with its leaks always ready to start and condensation takingits toll of coal every second. It it of great advantage to be able to place the mills in thebest relation to other m

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