. Electrical world. t in marks ( marks equal $) per kilo-watt. In order to make the comparison correct, the kilowatts are re-duced to thousand revolutions. These curves show that, compared \ \ 1 \ \ N-f \ 1 ^^a \ 1 -^ [^ l; <t iSOg ;\\ V ra f- I v\ A ^ ps. t^ \ v fii T, lUo it=a teo -T < ?•--. _, ~ !i!« Ss P^ii .w n — Lni =.00 .... shunt from full voltage down to zero, and then reverse. This givesnew possibilities for the employment of electricity in mines, greatest progress which has been made since the Paris Exposi-tion, and to which the Exposition at St. Louis will bear
. Electrical world. t in marks ( marks equal $) per kilo-watt. In order to make the comparison correct, the kilowatts are re-duced to thousand revolutions. These curves show that, compared \ \ 1 \ \ N-f \ 1 ^^a \ 1 -^ [^ l; <t iSOg ;\\ V ra f- I v\ A ^ ps. t^ \ v fii T, lUo it=a teo -T < ?•--. _, ~ !i!« Ss P^ii .w n — Lni =.00 .... shunt from full voltage down to zero, and then reverse. This givesnew possibilities for the employment of electricity in mines, greatest progress which has been made since the Paris Exposi-tion, and to which the Exposition at St. Louis will bear eloquenttestimony, lies in the single-phase field. The cause for this ad-vance was the increasing demand for a practicable electric systemfor long-distance electric railways. The variable-speed, single-phasemotor was the long-looked-for solution of this vital problem. It isgratifying to state that several types of this motor have been devisedrecently both on this side of the ocfan and in Europe. At St. Louis. \ \ r Y x^ \\ ^ -*v^. i ^ |2J2. &! T [%4. -rt-rl.,. \ % %^^^.n996 .... 1 - at 1000 —*• KW; at 1000 :URVES SHOWING CHANGES IN CONSTRUCTION OF ELECTRICALMACHINERY. with the year 1896, the same output of kilowatts is now obtained withonly half the material used at that time. As to direct-current dynamos, we see some improvements since1900, inasmuch as the armature reaction and the distortion of themagnetic field have been remedied by the compensation winding ofDeri and others, and a very important use has been made of this new^feature in employing electric machinery for hoisting in mines, whereit is necessary to regulate, under the full current, the voltage in the ^j>rTr ^^T-^^^ FIG. 7.—BRIDGE. SHOWING ILLUMINATION LAMPS USED ON GROUNDS. there will be ample opportunity to see these new motors in operationand engineers will have a chance to convince themselves as to
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
