A shorter course in woodworking; a practical manual for home and school . (or girder) can be pjg ^55 supported by braces as in Fig. 556. The weight on the beam, bearing downward, will push or thrust on them, andthey will be under compression, one half the thrust being put upon each brace which in turn pushes against theabutment, or the braces can be put on top,and the middle of the beam hung from theirapex (Fig. 557). When the beam beginsto bend with the weight applied, it pullson the rod at the middle. This rod, hang-ing from the apex, pushes the braces, andFig. 557 the braces, being fastened
A shorter course in woodworking; a practical manual for home and school . (or girder) can be pjg ^55 supported by braces as in Fig. 556. The weight on the beam, bearing downward, will push or thrust on them, andthey will be under compression, one half the thrust being put upon each brace which in turn pushes against theabutment, or the braces can be put on top,and the middle of the beam hung from theirapex (Fig. 557). When the beam beginsto bend with the weight applied, it pullson the rod at the middle. This rod, hang-ing from the apex, pushes the braces, andFig. 557 the braces, being fastened to the beam, in turn put the beam under tension. As another illustration, it is com-mon to strengthen or stiffen a beam as in Fig. 558. The weight at Wbending the beam, pushes the strut or block A, and this pulls on the rod,which applies compression to the beam. These crude illustrations give theclue to the general principles which, often carried much farther, apply tothe construction of many comparatively simple pieces of work, as well asroofs, bridges, and the Appendix 217 3^ X 12 Have a few hundred little strips of soft pine perhaps >^ xprepared. Very little force will break one of these pieces. Nail themtogether to form a simple lattice bridge as shown in Fig. 559, making itperhaps 6 or 8 long and each side or truss several strips in thickness. Compfession
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorklondongpput
