| 11. | The Perhapsatron used a toroidal tube made in the local glass shop.
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| 12. | The shape often used is a toroidal or doughnut-shaped ferrite core.
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| 13. | A drawback of toroidal transformer construction is the higher labor cost of winding.
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| 14. | A toroidal Universe could behave like a normal Universe with periodic boundary conditions.
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| 15. | It is toroidal, which means it can be embedded on a torus.
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| 16. | Toroidal groups play an important part in the theory of compact Lie groups.
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| 17. | One design uses water sprayed from a nozzle facing a toroidal charged electrode.
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| 18. | Compact toroid concepts are generally less well developed than those of toroidal machines.
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| 19. | Parson's model of the atom inspired several other toroidal ring models.
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| 20. | The term " toroid " Is also used to describe a toroidal polyhedron.
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