- Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz. The visible band sits adjacent to the infrared (with longer wavelengths and lower frequencies) and the ultraviolet (with shorter wavelengths and higher frequencies), called collectively optical radiation.
- Fremont Bridge (historylink.org)
The Fremont Bridge, the first double-leaf bascule drawbridge spanning the Lake Washington Ship Canal, opened June 15, 1917, 19 days before the Government Locks at Ballard were officially dedicated. The bridge links the neighborhoods of Fremont and north Queen Anne, previously connected by a streetcar-carrying wooden trestle.