The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . which byreason of their shape give support one to another, and to the super-Arcbes imposed weight, the resulting load being transmittedthroughthe, blocks to the abutments upon which the endsof the arch rest.; An arch, should be composed of such_materialsand designed of such dimensions as to enaWe it toretam its propershape and resist thS crushing strain imposed upon it,. The abutments-? - -^ also must :be strpng 3fen© p- ^^^^ enough to take, safely the thrust of theweighted arch, as theslightest, m
The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . which byreason of their shape give support one to another, and to the super-Arcbes imposed weight, the resulting load being transmittedthroughthe, blocks to the abutments upon which the endsof the arch rest.; An arch, should be composed of such_materialsand designed of such dimensions as to enaWe it toretam its propershape and resist thS crushing strain imposed upon it,. The abutments-? - -^ also must :be strpng 3fen© p- ^^^^ enough to take, safely the thrust of theweighted arch, as theslightest, movement inthese suppprts will causedeflectipn and putward thrust of—., . ? . an arch, decreases as it iSSii^n^ approaches the ,semir:Otol^dpc. VV^^^^^ ^^^^^ but the somewhat prevalentidea that in the latterform np thriJlsting talyesplace is at variance withfact. , : . ,\ •- Arches in/brickworkmay be classed underthree, heads: plainarches, rpugh-cut andgauged. , Plain archesare built of uncutbricks, ,and :§ince thedifference between theouter and inner peri- ongrating. Fig, phery of the arch requires the parts of which an arch is made up tobe wedge-formed, which an ordinary brick is not;, the difference mustbe made in mortar, with theresult that the joints become wedge-shaped. This obviously gives an objectionable inconsistency ofmaterial in the arch, and for this reason to 9bta,in greatest strengthit is advisable to build these arches in independent rings of half-brickthickness. The undermost rings should have thin joints, those ofeach succeeding ring being slightly thickened. This prevents thelowest ring from settling while those aboyp remain in position, which would cause an ugly fissure. In work of large spanbondingblocks or lacing courses should be built into the arch, set incement and runnmg through^ its thickness at intervals, care_ beingtaken to introduce the lacing course at a place where the joints ofthe various rings coincide. Stone blocks in the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
