¶ Octahedron (2)
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Index Entry
Octahedron: Eighth-octahedra:
"The spherical octahedron’s triangle is the only triangle in which the center of area of the triangle occurs at mid-altitude of the triangle’s three perpendicular bisectors of its three corner angles:
[diagram]
“In modern ocean cruising sailing craft in the high seas routes often cross the main ocean highway of steam and diesel ship channels. These great new high speed ships often operate by automatic navigational equipment with a watch officer idly standing by. They rush forward through night and fog at speeds in the 20-knot range. Little sailing craft up to 72 feet in length with their minuscul pear red, green, and white navigational lights are not visible from any great distance-- and often in high waves they are approximately invisible. Such sailing ships have relatively little metal in them. The radar scopes of the big ships show readily recognizable pips”
¶ Citations
- RBF Ltr. to Stephen Barba, N. Miami Beach, Fl.; 4 May’76
