. Electrical world. kaliindustry and with the refining of copper, lead and gold. Fitz Geraldgives a review of the electric furnace industries in 1903. Muchprogress has been made in furnace design, and it is probable that infuture the electric furnace will be applied to processes requiring onlya comparatively moderate temperature, but exact temperature regu-lation.—Electrochem. Ind., January. Units, Measurements and Alternating-Current Wattmeter.—An illustrated de-scription of a new alternating-current integrating wattmeter of theinduction motor type, devised by Ferranti
. Electrical world. kaliindustry and with the refining of copper, lead and gold. Fitz Geraldgives a review of the electric furnace industries in 1903. Muchprogress has been made in furnace design, and it is probable that infuture the electric furnace will be applied to processes requiring onlya comparatively moderate temperature, but exact temperature regu-lation.—Electrochem. Ind., January. Units, Measurements and Alternating-Current Wattmeter.—An illustrated de-scription of a new alternating-current integrating wattmeter of theinduction motor type, devised by Ferranti. The aluminum rotable?disc, D, mounted on the spindle, S, and geared to a train of wheels,C T, actuating the index hands, serves the double purpose of anarmature receiving the driving torque of the meter coils and also theretarding torque of the permanent magnets, P M. One shunt coil,ShC, placed round the coil, C, of a special tubular electromagnet,TM, constitutes the shunt system. The core of this magnet has. three outward radial poles, P-, alternating with four inward radialpoles, Pi, from the shell or tube of the shunt magnet, the plane ofthese poles being horizontal and parallel to the disc. Since the shuntcircuit in the induction motor type of meter must be highly inductive,this special tubular magnet has been adopted, no chocking coils, sec-ondary circuits, resistances or compensating coils being series system consists of a slotted armature, S A, above the disc,the series coils, Se C, being wound in these slots. The slots of theseries armature are almost directly above the poles of the tubularmagnets. If the shunt circuit be inductive, the eddy currents pro-duced in the disc by the shunt field will be in phase with the im-pressed These eddy currents are acted on by the series field,which is in phase with the load current, giving a driving torque onthe disc proportional to the of the circuit multiplied by theamperes and by the cosine of the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
