| 1. | The first hyperboloid cooling towers were built in 1918 near Heerlen.
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| 2. | Le Corbusier and F�lix Candela used hyperboloid structures ( hypar ).
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| 3. | The shape of the Vortex Tower is a hyperboloid of revolution.
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| 4. | Mass-shell hyperboloids are ` squashed'into a cylinder.
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| 5. | This model is related to the hyperboloid model as follows.
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| 6. | The " bishop's mitre " spires are capped with hyperboloids.
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| 7. | The hyperboloid structure consists of 16 identical concrete columns assembled on site.
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| 8. | The one-sheet hyperboloid has two positive eigenvalues and one negative eigenvalue.
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| 9. | The two-sheet hyperboloid has one positive eigenvalue and two negative eigenvalues.
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| 10. | The hyperbolic paraboloid and the hyperboloid of one sheet are doubly ruled surfaces.
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