Heads and followers of cast-iron, fitted with two brass rings babbited. Piston-rods of cold-rolled iron, fitted and keyed to pistons and crossheads.
GUIDES.
Of steel, or iron case-hardened, fitted to guide-yoke extending across, or secured to boiler and frames.
VALVE MOTION.
Most approved shifting link motion, graduated to cut off equally at all points of the stroke. Links made of the best hammered iron well case-hardened. Sliding block four and one-half inches long, with flanges seven inches long. Rock shafts of wrought-iron. Reverse shaft of wrought-iron, made with arms forged on.
THROTTLE-VALVE.
Balanced poppet throttle-valve of cast-iron, with double seats in vertical arm of dry-pipe.
DRIVING-WHEELS.
Centres of cast-iron, with hollow spokes and rims.
Tires of cast-steel, shrunk on wheel-centres. Flanged tires five and one-half inches wide and two and three-eighths inches thick when finished. Plain tires six inches wide and two and three-eighths inches thick when finished.