Figure 30  Detail of the corner bracket associated with the auxiliary support for the chair illustrated in fig. 18: (a) 1/4" acrylic support plate beneath the original upholstery, (b) ventilation hole in acrylic support plate, (c) bolt and T-nut, (d) 24-gauge copper Z-shaped bracket, (e) copper rivet, (f) diagonal brace, (g) triangular-shaped 1/8" acrylic support, (h) self-adhesive moleskin, (i) silk Crepeline fabric, (j) 4-ply laminated acid-free ragboard. (Drawing, L. Graves; artwork, Wynne Patterson.)