1 stress analysis. 2 working stresses. 3 design of shafts. 4 keys, pins, cotter and knuckle joints. 5 riveted joints. 6 welded joints. 7 cylinders, pipes and tubes. 8 shells, flat plates and cylinder heads. 9 threaded fasteners and power screws. 10 curved beams. 11 springs. 12 spur, helical, bevel and worm gears. 13 cpulings, clutches and brakes. 14 flexible machine elements.15 journal bearings. 16 rolling bearings. 17 fly-wheel. 18 cylinders and pistons of steam and internal combustion engines. 19 connecting rod. 20 vivrations. 21 packings and seals. 22 metal fits and tolerances. 23 preferred numbers.