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Archimedes first explains what his conoids and spheroids are, and then, after each 40 description, states the main results which it is the aim of the treatise to prove.

The undulating appearance of its roofline is a result of its double conoid design — something that from a distance gives the impression of enormous wings.

Fan Vault.—The vaulting in use in England in the fifteenth century, in which a series of conoids bearing some resemblance to an open fan are employed.

Thanks to the lateral point of the stone anvil, which served the part of the conoid bicorn, he was able to forge rings rude in shape but strong.

The fracture may take place through the attachment of the conoid and trapezoid ligaments, in which case the only symptoms are pain and tenderness at the seat of fracture, with impaired movement of the limb.