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2. Magdeburg hemispheres - Wikipedia

   en.wikipedia.org/wiki/Magdeburg_hemispheres

   The Magdeburg hemispheres are a pair of large copper hemispheres with mating rims that were used in a famous 1654 experiment to demonstrate the power of atmospheric pressure. When the rims were sealed with grease and the air was pumped out, the sphere contained a vacuum and could not be pulled apart by teams of horses. Once the valve was opened ...

3. Unisphere - Wikipedia

   en.wikipedia.org/wiki/Unisphere

   Over five hundred pieces of steel were used in the construction of the globe. [8] The Unisphere is tilted at an angle of 23.5 degrees, which is the angle of the Earth's equatorial plane to the plane of its orbit about the sun. [10] [31] Three large orbit rings of stainless steel encircle the Unisphere at various angles.

4. List of largest domes - Wikipedia

   en.wikipedia.org/wiki/List_of_largest_domes

   A dome is a self-supporting structural element of architecture that resembles the hollow upper half of a sphere. Every dome in the world which was the largest diameter dome of its time is listed. Notes: Each structure is only described in detail once (the appearance closest to the top of the page), even if it appears on multiple lists.

5. Demon core - Wikipedia

   en.wikipedia.org/wiki/Demon_core

   The demon core (like the core used in the bombing of Nagasaki) was, when assembled, a solid 6.2-kilogram (14 lb) sphere measuring 8.9 centimeters (3.5 in) in diameter.. It consisted of three parts made of plutonium-gallium: two hemispheres and an anti-jet ring, designed to keep neutron flux from "jetting" out of the joined surface between the hemispheres during implosi

6. Pit (nuclear weapon) - Wikipedia

   en.wikipedia.org/wiki/Pit_(nuclear_weapon)

   The pits of the first nuclear weapons were solid, with an urchin neutron initiator in their center. The Gadget and Fat Man used pits made of 6.2 kg of solid hot pressed plutonium-gallium alloy (at 400 °C and 200 MPa in steel dies – 750 °F and 29,000 psi) half-spheres of 9.2 cm (3.6 in) diameter, with a 2.5 cm (1 in) internal cavity for the initiator.

7. AOL

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   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

8. Betz mystery sphere - Wikipedia

   en.wikipedia.org/wiki/Betz_mystery_sphere

   The Betz mystery sphere is a metal sphere with an approximate diameter of 8 inches (20 cm) weighing nearly 22 pounds (10 kg) uncovered in 1974 by a family in Florida. [ 1 ] [ a ] Background

9. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!