A treatise on architecture and building construction . driven, otherwise, under alternate compression andtension, the joint is liable to work loose. The projectingends of the pieces at dc and// seiVe only to keep the top ofthe joint flush. 1)7. The joint shown in Fig. 24 is similar in constmctionto that in Fig. 23, except that the line dc is carried through the timber in a slantingdirection instead of parallelto the top and bottom, andis not continuous in eachtimber; that is, the line ofjunctiue on timber a ex-tends from d to / and thenmakes a break /^ at rightangles to r//and then pro-ceeds f
A treatise on architecture and building construction . driven, otherwise, under alternate compression andtension, the joint is liable to work loose. The projectingends of the pieces at dc and// seiVe only to keep the top ofthe joint flush. 1)7. The joint shown in Fig. 24 is similar in constmctionto that in Fig. 23, except that the line dc is carried through the timber in a slantingdirection instead of parallelto the top and bottom, andis not continuous in eachtimber; that is, the line ofjunctiue on timber a ex-tends from d to / and thenmakes a break /^ at rightangles to r//and then pro-ceeds from (? to f at the^^- ^*- same angle it started. The extent of this slant from the surface of the timber dependsupon tlic length of the joint, as the ciits dc and cf shouldnever be less than one-sixth the depth of the timber when atright angles to dc^ and when the angle c dI \f, less than 00degrees the distance c d should be increased. This style of joint is not as strong as that in Fig. 23when subjected to compression, but is somewhat stronger. § 9 CARPENTRY. 47 under tensile strain, as part of the stress is taken up by theiron bar j n, which is apphed in the same manner as inFig. 22. It is well adapted to a transverse strain, however,and when so intended, slight modification should be made,according to circumstances. When a beam is submitted to atransverse strain, its top is in compression and its under sideis in tension; therefore, a combination of two forms of jointshould be made to suit the two conditions. When the jointshown in Fig. 24 is used as a beam with a transverse strain,it is better to let the line c d run at right angles to the top ofthe beam and extend half way through, as the line cd inFig. 22. This adapts the upper half to a compressive strain,while the under side may be scarfed, as o cf in Fig. 24, andhave an iron bar or plate on the bottom. The rectangular hole, or key way, lop has its long side onthe cuts oe and dl, and the keys r and s have each a fu
Size: 1858px × 1344px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
