er being cut at the thickest or thinnest part . When cut at the thickest part , they wear better and last much longer than those cut at the thinnest part , while concentric rings seem to answer all the requirements . However , we certainly prefer , with single cast - iron rings , the wedge fitted… … position . Fig . 463 . — Piston with Packing Ring in Four Segments . The various arrangements a , Piston , b , Junk ring , c , Packing ring , d d , Springs with set screws . e , Cotter . f , Piston rod . of pistons now claim our attention ; the example under notice has one packing ring , cut into…
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