. The testimony of the rocks; . itions which separate into chambersaU the whorls of the ammonite except the outermost one,21 242 GEOLOGY IN ITS BEARINGS were exquisitely adapted to strengtheD, by the tortuouswindings of their outer edges, a shell which had to combinegreat Hghtness with great powers of resistance. Itself acontinuous arch throughout, it was supported by a series ofcontinuous arches inside, somewhat resembling in form thegroined ribs of the Gothic roof, but which, unlike the pon-derous stone work of the mediaeval architects, were as lightas they were strong. And to this combinati
. The testimony of the rocks; . itions which separate into chambersaU the whorls of the ammonite except the outermost one,21 242 GEOLOGY IN ITS BEARINGS were exquisitely adapted to strengtheD, by the tortuouswindings of their outer edges, a shell which had to combinegreat Hghtness with great powers of resistance. Itself acontinuous arch throughout, it was supported by a series ofcontinuous arches inside, somewhat resembling in form thegroined ribs of the Gothic roof, but which, unlike the pon-derous stone work of the mediaeval architects, were as lightas they were strong. And to this combination of archesthere was added, in the ribs and grooves of the sheU, yetanother element of strength, — that which has of late beenintroduced into iron roofs, which, by means of their corru-gations, — ribs and grooves like those of the ammonite, —are made to span over wide spaces, without the support ofbeams or rafters. Still more recently, the same principlehas been introduced into metallic boats, which, when corru- Fig.
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