THIS little book of 75 pages is designed to give to amateurs practical information as to the construction of a small working dynamo-machine. What is aimed at is the building up of a machine capable of ...

The cartoonist of the future wouldn’t have to lift a finger, thanks to tomorrow’s wonderful machines. At least that was the idea behind this 1923 cartoon by H.T. Webster. Americans of the 1920s saw a ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

A small Wheatstone-style dynamo mounted on a wooden base. A 13" diameter iron crank wheel with a wooden handle is used to operate the demonstration. Two vertical field poles each wrapped with ...