x CONTENTS. 
Desicn or Fretp Macnert: General Form of Field Mag- 
net—Advantages and Disadvantages of Multipolar Ma- 
chines—Number of Poles—Sectional Area of Magnet 
Frame —Leakage Factor—Length of Magnet Cores— 
Example—Bipolar Design—Four-pole igen = 
of Magnet Cores.. 05.45. ..3 25 Quine Sipe ee 61-79 
CALCULATIONS OF MaGNetiziINGc Forces: Total Magne- 
tizing Force—Magnetizing Force for any Part ofa 
Circuit—Magnetization Curves—Compensation Am- 
pere turns—Examples..: 0.5 «4 s:s:03,s19'9 ie susie aia sine 79-90 
CALCULATION OF MaGNET WINDING: Series, Shunt, Com- 
pound and Differential Field-Winding—Determination 
of Magnet Winding—Calculation of Series Winding— 
Calculation of Shunt Winding—Calculation of Com- 
pound Winding—Examples.................002seeee 91-114 — 
CALCULATION OF ErrFicIENcIES: Electrical Efficiency— 
Commercial Efficiency—Friction Losses in Dynamo 
Electric Machines—Efficiency of Belt-driven Ma- 
chines—Losses in Dynamo Belting—Gross Efficiency— 
Weight Efficiency—Examples................-000- 114-128 
Questions on the Design of Direct-current Dynamos and 
Motors: 6 obsesb ss coh ao ee Mele eae Se eee 129 
COOUSTIONG 5 05 i5:cs oa deh aie hee ee ee ee Say Neen Eo Sn A 14 
