London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 82
equal half the span of the arch, which is the radius of the samecircle. Of the Hyperbolic Arch. — The curve of this arch so nearlyresembles that of the parabola, as to require similarly formedextrados, having this difference, that the base h a [Jig. 13.)must equal a /, having h g parallel with the… … three curves. First, the dotted curve, which is the cycloid ;second, the semicircular arch [abode) passing through thethree points b, c, and d of the cycloid, and having its centre at i;and the third is also a semicircular arch [fg i c h), having itscentre at ^, which coincides with the cycloid…
Architecture
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