but little feit ; and if two rings were fitted in recesses , one hole suffices at each end . Thin spring rings of brass have been used with advantage ; in this case the piston is made quite solid at the ends , with three recesses turned out on the rubbing surface for the reception of the rings ,… … often successfully used ; Fig . 317 . — Air - pump Plunger and Gland . the piston is cast as before , . Plunger , b , Stuffing box and gland . C , Rod . and the space for the packing is filled up entirely with curved blocks , which are made to overlap one another at the joinings , and then the ring…
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