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...ns|url=https://books.google.com/books?id=pDbQVE3IdTcC&q=relay+Joseph+Henry+1835&pg=PA311|page=311|isbn=9780471660248|date=2005-01-28}}</ref><ref>{{cite boo [[Category:1835 introductions]] ...

...built a toy electric locomotive, powered by a primitive electric motor, in 1835. In 1838, a Scotsman named [[Robert Davidson (inventor)|Robert Davidson]] b [[Category:19th-century introductions]] ...

...ty | volume = 4 | issue = 3 | pages = 4–20 | date = December 2008 | issn = 1835-3800 | doi = 10.3316/JHS0403004}}</ref> [[Category:1990 introductions]] ...