11. A second side site provides a second TDOA and hence a second hyperboloid . 12. Gray shows where the hyperboloid model is implicit in later writing by Poincar? 13. Similar hyperboloid structures appeared abroad only ten years after Shukhov's invention. 14. Quadric surfaces include ellipsoids ( including the sphere ), paraboloids, hyperboloids , planes. 15. A hyperboloid cooling tower was patented by Frederik van Iterson and Gerard Kuypers in 1918. 16. The shape of the roof is based in a hyperboloid of revolution with asymmetric sections. 17. And finally, the " bishop's mitre " spires are capped with hyperboloid structures. 18. A hyperbolic hyperboloid of one sheet. 19. Shukhov is particularly reputed for his original designs of hyperboloid towers such as the Shukhov Tower. 20. The cathedral is a hyperboloid structure constructed from 16 concrete columns, weighing 90 tons each.
