NCE 



[Entered at the Post-Offlce of New York, N.Y., as Second-Class Matter.] 



A WEEKLY NEWSPAPER OF ALL THE ARTS AND SCIENCES. 



Seventh Year. 

 Vol. XIII. No. 331. 



NEW YORK, June 7, iS 



Single Copies, Ten Cents. 

 $3.50 Per Year, in Advancb. 



SOME NEW ELECTRIC MOTORS. 



For several years past the C. & C. Electric Motor Company have 

 devoted their entire energies to the manufacture of small motors, 

 having built thirty-six hundred motors of i horse power, and over 

 five hundred i and + horse-power motors. While this company 

 have built motors as large as 5 horse-power, they have not until 

 recently, when the new shops were completed, undertaken to sup- 



The machines present a few peculiarities. The field-magnet 

 cores are drop-forged, are circular in shape, and are concentric 

 with the shaft, being oblong in cross-section, and of a width equal 

 to the axial length of iron in the armature. These cores, when 

 bolted to the base of the pole-pieces, completely surround the 

 armature, which is of the drum type, and in its general proportions 

 resembles a Gramme ring, in which the radial depth is increased 

 until the annular ring reaches the shaft, thus forming a drum ar- 



FIG. 



FIFTEEN-HORSE-POWER C. & C. MOTOR. 



ply those of larger power, their old shops having been fully occu- 

 pied with orders for small motors. 



We recently described their new factory, and since the company 

 moved in, Mr. Lemuel William Serrell has designed for them mo- 

 tors as large as 25 horse-power. The design of these larger motors 

 is shown in the accompanying cuts. Fig. i is of a 15 horsepower, 

 Fig. 2 of a 3 horse-power, motor. 



mature of large diameter. This form requires little wire, and the 

 air-space resistance between the pole-piece and the armature is re- 

 duced to a minimum. 



The windings are calculated by dealing with the magnetic cir- 

 cuit as if it were an electric circuit, following Ohm's law : magnetic 

 potential taking the place of volts ; and lines of force, current ; and 

 the resistance of the iron when below saturation to the flow of 



