Spherical Shape

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Spherical aberration - [plane] [sections] In optics, spherical aberration is an image imperfection that occurs due to the increased refraction of light rays that occurs when rays strike a lens or mirror near its edge, in comparison with those that strike nearer the center. It is often considered to be an imperfection of telescopes and other instruments which makes their focusing less than ideal due to the spherical shape of lenses and mirrors.

21st Century Airships - 21st Century Airships is a company that makes spherical airships. The spherical shape has advantages for low-velocity craft used for heavy lift and high altitude craft including stratospheric airships.

Polyteichus - The zooaria of Polyteichus are primitive representatives of bryozoans in order of the Cryptostomata are spherical in shape, semi-spherical or disc shaped. The zooecia are wide prism shaped, and there are only two types, the Acanthocladia and the Polypora.

Globular cluster - A globular cluster is a spherical bundle of stars (star cluster) that orbits a galaxy as a satellite. Globular clusters are very tightly bound by gravity, which gives them their spherical shape, and extreme density (in relative terms) towards their core.

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Cupola - A spherical ceiling, or a bowl-shaped vault, rising like an inverted cup over a circular, square, or multangular building or any part of it.

Design e - Makes unusual spherical shape and curvy loudspeaker. UK.

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Spherical Aberration -   Spherical Aberration Spherical Models by Magnus J. Wenninger, X Well-illustrated, practical approach to creating star-faced spherical forms that can serve as basic structures for geodesic domes. Complete instructions for making models from circular ...

Spherical Aberration -   Spherical Aberration Spherical Models by Magnus J. Wenninger, X Well-illustrated, practical approach to creating star-faced spherical forms that can serve as basic structures for geodesic domes. Complete instructions for making models from circular ...

Spherical Aberration -   Spherical Aberration Spherical Models by Magnus J. Wenninger, X Well-illustrated, practical approach to creating star-faced spherical forms that can serve as basic structures for geodesic domes. Complete instructions for making models from circular ...

Fiskars Shape Template -   Fiskars Shape Template Mission-Critical Security Planner: When Hackers Won't Take No for an Answer by Eric Greenberg, All ... hands-on involvement from the start. You’ ll see your own customized security plan template begin to take shape as you complete the accompanying worksheets. Choose any one of the security plans outlined in this book, ...

Aberration Chromatic in Lens - ... phenomenon of different colors focusing at different distances from a lens (see the article for an excellent illustration). Spherical aberration - [plane] [sections] In optics, spherical aberration is an image imperfection that occurs due to the increased refraction of light rays that occurs ...

Circumference of the Earth - ... the circumference from a given point. Stargate (device) - In the Stargate science fiction universe, Stargates are large ring-shaped devices with nine 'chevrons' equally spaced around their circumference, and 39 symbols displayed on an inner ring. They ... geometry to come up with a circumference of 250,000 stades, which, assuming that our estimates of the spherical Earth. Lactantius (245-325) calls it "folly" because people on a sphere casts a circular shadow in ...

Boiler Water Testing - ... stone when used in cooking. boilerwatertesting This flat secondary mirror. If the focal plane. This ensures that the shape of the primary mirror and mount. Another reason to grind and figure the primary mirror when used with ... a special polishing lap and a small flat secondary mirror. If the focal plane. This ensures that the shape of the mirror grinds to a shallow spherical section, and then carefully "figured" to a paraboloid using ...

Aberration Chromatic in Lens - ... phenomenon of different colors focusing at different distances from a lens (see the article for an excellent illustration). Spherical aberration - [plane] [sections] In optics, spherical aberration is an image imperfection that occurs due to the increased refraction of light rays that occurs ...