Fig. 52.
Fig. 53.......Fig. 54
Take two pieces of finished material, fasten together as in Fig. 53 and cut out as shown at A and B in Fig. 54. The opening A is made so that the piece can be hung over the shaft, and the opening B is made for the reception of a wooden straight-edge.
Make the straight-edge out of 1¼-inch stuff. Be sure that the edges are parallel, the width just enough less than the width of opening B, Fig. 55, to enter it, and the length 6 or 8 feet, to suit convenience. Use the apparatus with a level, as in Fig. 55, taking care that the suspension pieces are always on the same size shaft.
Fig. 55.