Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 179
ing its field, as shown in Fig. 154.The field current is taken from the source of constant potential,a variable resistance VR of great value (or a potentiometer) and anammeter AM are placed in series with the fields F. The ammeter willmeasure the current which is varied from zero to a maximum… … 2 3 CALCULATIONS 145 The commutator upon which the brushes set is designated by C.A magnetization curve is really expressed with the co-ordinatesm. m. f. and $, i. e., between the force producing flux and the actualflux resulting. These co-ordinates are somewhat difficult to measuredirectly so that…
Electrical engineering
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