. Cyclopedia of architecture, carpentry, and building : a general reference work. Fig. H*i- Bearing of Stone Lintel. 139 130 BUILDING SUPEKINTENDENCE strongly made and should be left in position until the mortar in thejoints has become hard. Centers for small arches are usually madeof plankj with two ribs set apart to the thickness required, and con-nected for a bearing surface bystrips of I X 2-inch stick nailedto the tops of the ribs. A centerof this sort is supported bywooden posts from the sill orfloor below. If the arch is of alarge span, the pieces wall bemore in number, in order to usep
. Cyclopedia of architecture, carpentry, and building : a general reference work. Fig. H*i- Bearing of Stone Lintel. 139 130 BUILDING SUPEKINTENDENCE strongly made and should be left in position until the mortar in thejoints has become hard. Centers for small arches are usually madeof plankj with two ribs set apart to the thickness required, and con-nected for a bearing surface bystrips of I X 2-inch stick nailedto the tops of the ribs. A centerof this sort is supported bywooden posts from the sill orfloor below. If the arch is of alarge span, the pieces wall bemore in number, in order to useplanks of ordinary wadth, andthe center will need additionalsupport and ties as shown by These centers should bewedged up in setting, to permit of easy adjustment or removal. GENERAL RULES FOR LAYING STONE. lo Build the masonry, as far as possible, in a series of courses,perpendicular, or as nearly so as possible, to the direction of thepressure which they have to bear, and by breaking joints, avoid alllong continuous joints parallel to that Fig. 147. Bnlltwp Cornice.
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