USS Blue Light [SEP] conflict
USS Blue Light
USS "Blue Light" was a steam tug built for the United States Navy during the American Civil War. She was used by the Union Navy as an ordnance tugboat in support of the Union Navy blockade of Confederate waterways.
"Blue Light" configured to carry ammunition to Union Navy ships.
"Blue Light" — a screw tug laid down in 1863 by the Portsmouth Navy Yard in Kittery, Maine — was launched on February 27, 1864 and fitted out to carry ammunition from magazines ashore to
i.e., downwards) to blue away from it, because red light is refracted less strongly than blue light.
See also.
- Circumhorizontal arc
- Circumzenithal arc
- Kern arc
- Subsun
External links.
- www.paraselene.de - Tangent Arcs (including several HaloSim simulations.)
- Atmospheric Optics - Alaska Lower Tangent Arc - Great photo by Ryan Skorecki.
- Atmospheric Optics - Lower Tangent arc - A photo taken from an aeroplane.
- Lower Tangent Arc Sep 25, 2005 - Photos