The story of a house . ,!.»» • Fio. 10. twenty-five centimetres, and on these arches, which replacethe surplus of thickness, or lining-wall, of which I spoke justnow, he keyed in his vault. This drawing in perspectivewill enable us to seize this system of building. Thus theupper wall leaves the vault independent, and rises uprighton its lower facing. You understand, do you not? Well, let us examine tinslittle staircase, which, perhaps, you have not observed atten-tively. It is four old-fashioned feet in width, or one metrethirty centimetres; a sufficient width to carry down butts ofwine. See h
The story of a house . ,!.»» • Fio. 10. twenty-five centimetres, and on these arches, which replacethe surplus of thickness, or lining-wall, of which I spoke justnow, he keyed in his vault. This drawing in perspectivewill enable us to seize this system of building. Thus theupper wall leaves the vault independent, and rises uprighton its lower facing. You understand, do you not? Well, let us examine tinslittle staircase, which, perhaps, you have not observed atten-tively. It is four old-fashioned feet in width, or one metrethirty centimetres; a sufficient width to carry down butts ofwine. See here (Fig. 11); the creeping-vault is composed of 66 THE STORY OF A HOUSE. as many superincumbent arches as there are steps; it lookswell, is solid, and easy to build. In short, where stone stepsare established, on these are placed successively a ?woodencentring, which, of course, juts out at each step, and on thiscentring an arch is placed, being built rapidly, as the stones. Fig. 11. are already cut. Thus the arches follow the profile of thesteps; and the centring being carried, after the closing ofeach arch, upon the following step, commencing with thelowest, two men can key in five or six of these arches in a PAULS COURSE OF PRACTICAL CONSTRUCTION. 67 day. If there are twelve steps, this creeping-vault maytherefore be closed in two days. You see, this constructionmust be indicated in perspective, and geometrically, in yourto-days resume, A and B. Let us ascend to the ground-floor; observe how, on theinterior, the walls betray efflorescences which resemblecarded cotton. That is saltpetre, which is formed on theinterior of the itone, and which, by the dampness of thesoil, crystallizes on the facing. Saltpetre alters the stone,ends by gnawing it, and eats off all the paint which is puton the interior wall. Waterproof coatings are made toaiTLst the effect of saltpetre, but these only retard itsappearance, and do not destroy the evil, and the coatingssoon fa
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectarchitecturedomestic
