. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . Fig. 71. thick, 8 wide, and 5J long. The mortise should be cuta little deeper than the tenon. Drip-holes^from the mortise to the outside will assist indraining off water that may accumulate in thejoint and thus prevent the rapid decay thatwould otherwise ensue. These joints are verytroublesome if a single post decays and requiresrenewal. It is generally required that the mor-FiG. 72. tise and tenon should be thoroughly daubedwith paint before putting them together. This will te
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . Fig. 71. thick, 8 wide, and 5J long. The mortise should be cuta little deeper than the tenon. Drip-holes^from the mortise to the outside will assist indraining off water that may accumulate in thejoint and thus prevent the rapid decay thatwould otherwise ensue. These joints are verytroublesome if a single post decays and requiresrenewal. It is generally required that the mor-FiG. 72. tise and tenon should be thoroughly daubedwith paint before putting them together. This will tend tomake the joint water-tight and prevent decay from the accu-mulation and retention of water in the joint. (b) The plaster joint. This joint is made by bolting andspiking a 3Xl2 plank onboth sides of the joint. Thecap and sill should benotched to receive the are greatly facili-tated by the use of thesejoints. This method has beenused by the DelaAvare andHudson Canal Co. [R. R.]. (c) Iron plates. An iron plate of the form shown in Fig. 74. Fig. 73. §171. TRESTLES. 207
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Keywords: ., bookcentury1900, bookdecade1910, bookidrailr, bookpublisheretcetc
