er , for surface condensers it is not so compact as a plain piston . Some - times the water chambers at the ends of the pumps are partially filled up with a cylindrical casting , formed on the end covers ; the piston rod works through this at one end , and it is left plain at the other end of the… … useless . Fig . 316 . — Air - pump Barrel and Piston . The pistons are of the usual A , Barrel , b , Piston . C , Rod . D , Junk ring . Ej Packing ring , f , Parallel part on rod . kind , cast in brass ; some are G G , Tap bolts . merely recessed for the recep - tion of a plaited gasket , while…
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