. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . Fig. 70. Tic. 09. wide, and P>V long. The mortise should be euta little deeper than the tenon. ^Drip-holesfrom 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 deca3^s and requiresrenewal. It is generally required that the mor-tise and tenon should be thoroughly daubedwith paint before putting them together. This will tend
. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . Fig. 70. Tic. 09. wide, and P>V long. The mortise should be euta little deeper than the tenon. ^Drip-holesfrom 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 deca3^s and requiresrenewal. It is generally required that the mor-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 bv bolting andspiking a 3Xl2 plank onboth sides of the joint. Thecap and sill should benotched to receive the are greath^ facili-tated by the use of thesejoints. This method has beenused by the Delaware andHudson Canal Co. [R. R.]. (c) Iron plates. An iron plate of the form shown in Fig. 72. Fig. 71. § 137. TRESTLES. 169 in Fig. 72 (a). Bolts passing
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