. Electrical world. s (Fig. 2). For .i- = v, the line of force pass- a 2 ing the given point does not leave the inducing coil, the fallsto zero and remains so until the displacement becomes greater than / V2 for r sill a 2 \I V2. OB + BC = y + a From this moment the changes sign, since it passes under When each coil of the armature comprises several concentric coilsand separated from each other by two slots, it suffices, evidently,to apply the formula to each and take the sum of the results, invirtue of the principle that the integral of a sum is equal to thesum of the integrals
. Electrical world. s (Fig. 2). For .i- = v, the line of force pass- a 2 ing the given point does not leave the inducing coil, the fallsto zero and remains so until the displacement becomes greater than / V2 for r sill a 2 \I V2. OB + BC = y + a From this moment the changes sign, since it passes under When each coil of the armature comprises several concentric coilsand separated from each other by two slots, it suffices, evidently,to apply the formula to each and take the sum of the results, invirtue of the principle that the integral of a sum is equal to thesum of the integrals of the parts. This will be done in the next part the elementary coil of the following field pole. It diminishes in of this article. absolute value to zero for a displacement equal to —. then increases again, after having changed sign with the current, until the end ofthe half period. We will obtain the mean value of the at the given point by 11 ?i _, 1 ^ 1 m 1 -^;- —>; H-| 1 rh 0! i I 1 ! ; !b i ^ A. .\LCUL.\TION OF AMPERE-TURNS. referring to the hatched surface and taking account of the negativepart. It is easily seen that this surface has for expression, JN. ...-/ 2 b 1^ TT y which reduces to — sin cos •^^•^o ?^0 2 a To obtain the mean over the width of the polar step, itsuffices to take, as previously stated, the mean of all the means a awhen y varies from to -\ , whence + T 12 b n{F = sin AT /^ & T 0 2 dy. 4 6 TT which reduces to sin -V/^,- and substituting the value 7r2 a 2 The Gas Engine for Central Station Service. At the February meeting of the New York Electrical Society D. Mershon read a paper with the above title, giving the re-sults of a recent study of the .engineering aspects of the gas enginequestion, in the course of which Mr. Mershon visited most of thelarge gas engine installations and manufactories both in this countryand abroad. The paper sketches the theory of the gas engine, pointsout the important bearing of compressio
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
