Electricity for everybody; its nature and uses explained (1895)
Atkinson, Philip · New York, The Century Co. · leaf 151
srun by a belt from the band-wheel shown on the right,while the large dynamo is run by the band-wheel on theleft, The current from the exciter traverses a set of finewire coils, wound on the field-magnet cores, but does notmagnetize the field sufficiently for heavy electric work.Hence a separate… … 136 ELECTRICITY FOR EVERYBODY. collecting rings, by which part of the armature currentis made direct for the purpose of magnetizing the field.Increase of electric resistance in the external circuit,caused by the increase of electric work, produces a pro-portional increase in the volume of this…
Electricity
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