Measure and cut the wooden trim, using the saw, into the following strips: two 4-inch strips, two 6-inch strips and four 9-inch strips.
Use the wood glue to attach a 9-inch strip lengthwise to the plank so it covers the upper 1 inch-by-9 inch area of the plank face. Attach a second 9-inch strip to cover the lower 1 inch-by-9 inch area of the plank face. A base for the slide has now been constructed. The exposed part of the plank surface should be the 2 inch-by-9 inch rectangular section lying between the trim strips. This open rectangle will accommodate the moving part of the slide. Allow the glue to dry.
Measure 1.5 inches from either end of the 9-inch strips that have been glued in place, and mark the trim at these points with a pencil.
Apply glue to a 6-inch strip and position it on top of the 9-inch strip between the pencil markings. Push the 6-inch strip a distance of 1/16 to 1/8 inch toward the middle of the plank so it slightly overhangs the 9-inch strip it is resting on. Glue the remaining 6-inch strip on top of the other 9-inch anchored strip, making sure to also push this strip 1/16 to 1/8 inch toward the center of the plank.
Bridge the ends of the 9-inch strips on the base by gluing the 4-inch strips flush against the ends of the 6-inch strips. The result is a 4 inch-by-6 inch frame glued on top of the slide base. The frame and the base complete the stationary part of your linear slide rule.
Print out a logarithmic scale template available from the National Council of Teachers of Mathematics or http://img511.imageshack.us/img511/7657/sliderulenn3.gif. Use a print resolution of at least 300 dpi to ensure the scale can be read easily. Cut the two scales from the template printout and attach each scale, using paper glue, to the two remaining 9-inch strips to create two logarithmic rulers. These rulers serve as the two moving parts of the linear slide.
Complete the linear slide rule by sliding the two graduated strips into the rectangular space beneath the frame of the base. Insert the two strips with the scales facing upwards and the scale edges touching.