A very simple electrical resistance thermometer is described that can be built, calibrated and tested in a school laboratory at virtually no cost. With it, flames, focused sunlight and other high temperature sources can be probed. The...

The biography of the fascinating African-American inventor, Lewis Latimer. In addition to finding out about his development of the carbon filament for the incandescent lamp, you can read about his expertise in patent law, his association...

This primary source set explores the development, commercialization, and impact of electricity.