(The stereo-chemistry of carbon compounds has led to the spatial representation of a carbon atom as being situated at the centre of a tetrahedron, the four valencies being directed towards the apices; see above, and Isomerism.) A form based on Kekule's formula consists in taking three pairs of tetrahedra, each pair having a side in common, and joining them up along the sides of a regular hexagon by means of their apices. [Please select]
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The floor was paved with little hexagon-shaped tiles of a wonderful old red. [Please select]
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To file a hexagon, or six-sided nut will be a good test with a file. [Please select]
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These are the equilateral triangle, the square, and the regular hexagon. [Please select]
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Of the three figures, the hexagon is the most proper for convenience and strength. [Please select]
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At other times she deposited an egg, which lay in an irregular position, on one side of the hexagon, and not fixed by an end to the bottom of the cell. [Please select]
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A washer, D, with a hexagon hole was fitted over the regular nut C, on the axle, and filed tapering so the forging or hook E, on the trailer attachment, could be kept in position. [Please select]
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