![](http://www.alamy.com/thumbs/6/6452E9EC-4AD2-49F2-883C-AD35584F6064/2D859HP.jpg)
A 19th Century illustration of the Edison-Hopkinson dynamo. As earlier types of Edison dynamo became obsolete improved designs came along and one Dr John Hopkinson improved performance by altering the field-magnets and modifying the armature of the machine, getting more iron into it, thus diminishing the magnetic reluctance in this part of the magnetic circuit.
Size: 3630px × 4352px
Location: Great Britain
Photo credit: © De Luan / Alamy / Afripics
License: Licensed
Model Released: No
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