The corners of frarr are then joined by diagonals, as in B, and then the centers of the top and bot and sides are joine"ti, as in C. This process of subdivision is continued wher the detail in the design requires additional intersections. To enlarge or reduce the pattern the baseline and one side are extended required distance, and the main diagonal projected as shown. Thin tracing p; can be used where it is undesirable to mark the original material. The photographic enthusiast who has access to an enlarger can "blow smallscale drawings to a required size by tracing the original drawing on trail cent tracing paper. With this tracing as a negative the enlargement can be traced by hand on a piece of wrapping paper, or it can be printed on paper : darkroom, or directly on the wood, metal, or fabric to be worked if it is coated with Multimulsion. To enlarge for tracing only, a simple mirrorscope can be constructed using available lens, a mirror, and a light source. In Figure 1.41 a wooden box with Fig. i.41. Mirrorscope. opening in the bottom for the material to be copied (D), has a m'.rror ( fastened at an angle that will project the image through the lens (L), fastenec place over a hole opposite the mirror. The box should be high enough or w enough to permit the installation of an electric socket (E) for a highwatt bulb Last but not least of the enlarging or copying devices is the old reliable par graph. From Figure 1.42 it is clear that the construction of this contrivana merely a. matter of accurately drilling the four hardwood strips to the ident: facings shown in the detail. This is done with the four strips clamped toget Г01 their ends are trimmed off, so that the first holes in strips (A ) and (B) Hk in. from the centers of the larger holes at the end where strip (.4) is pivo 42 . IS N4> 5|5 J to the block, with the end of strip (B) holding the tracing point; and 2% in. from the centers of the larger holes for the pencil in strip (C) with the tracing point in strip (D). As will be observed from the drawing, the ends of strips (B) and (C), where the holes are closely spaced, are connected to the ends of strips (D) and (A) where the holes are widely spaced. furniture construction methods Almost every article of wooden furniture is put together in one or a combination of three main methods of construction. These elementary forms have come down through the ages as arrangements of the grain in the various pieces to insure that the whole assembly shrinks or swells together. The first method is that of carcass or box construction as shown ir Figure i A3 In drawer A the grain of each piece is horizontal, so that CABINETMAKING if shrinkage takes place to any degree, there will be no danger of the parts s ting. In the same way the boxlike carcass or case В will shrink from front to b As already described, the dovetail joint is the most satisfactory corner joint; it be lapped where concealment is desirable, along the sides of the case.