this means should any of the screws get an extra turn , the pressure is in a measure transmitted , and better diffused amongst the others . The body and junk ring , for securing the packing rings , are of brass , and the packing ring of cast - iron , the piston rod being secured with a plain cotter… … Fig . 464 . Piston with two Packing Rings , with Collars formed on the Piston Rod . a , Piston , b , Junk ring . c , Packing rings . d , Wedge piece . ee , Springs with set screws . f f , Tapped holes for bolts for junk ring , g , Piston rod . H , Collars on piston rod . each , the springs being…
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