This section is from the book "Cyclopedia Of Architecture, Carpentry, And Building", by James C. et al. Also available from Amazon: Cyclopedia Of Architecture, Carpentry And Building.
The splices for tension which have so far been described have all been scarf joints, but there is a fished splice which is very commonly used for tension. This splice is shown in Fig. 63. The fish plates, in this case of wood, are cut into the two pieces to be spliced, so as to hold them firmly together. The pieces can not be pulled apart until one of the plates shears off along the dotted line A-B. The distance C-D must also be made large enough so that the piece will not shear. This splice is very often used for the lower chords of the various forms of wood trusses, and it is considered one of the best that has been devised for resisting direct tension.