{"version":"1.0","type":"link","title":"Channel surface - Newikis","description":"In geometry and topology, a channel surface or canal surface is a surface formed as the envelope of a family of spheres whose centers lie on a space curve, its directrix. If the radii of the generating spheres are constant, the canal surface is called a pipe surface. Simple examples are:","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://thumb.wikimedia.org/wikipedia/commons/thumb/8/86/Canal-helix-s.svg/1280px-Canal-helix-s.svg.png","thumbnail_width":1280,"thumbnail_height":652}