A hand cranked device onsisting of coiled metal wire and a magnet, demonstrate the principle elements of 19th and 20th century electrical generators, also called dynamos. Illustration from DYNAMO-ELECTRICITY, 1884 by George B. Prescott.

- Image ID: C6131P
A hand cranked device onsisting of coiled metal wire and a magnet, demonstrate the principle elements of 19th and 20th century electrical generators, also called dynamos. Illustration from DYNAMO-ELECTRICITY, 1884 by George B. Prescott.
Everett Collection Inc / Alamy Stock Photo
Image ID: C6131P
A hand cranked device onsisting of coiled metal wire and a magnet, demonstrate the principle elements of 19th and 20th century electrical generators, also called dynamos. Illustration from DYNAMO-ELECTRICITY, 1884 by George B. Prescott.