india rubber is placed . The hole in the india - rubber disc should fit loosely round the boss formed on the guard , and in no case should the india rubber be pressed down on the seat ing . These gratings consist of annular rings and ribs ra - diating to the centre of the boss , thus forming a… … casting , the joint being made Fig . 32T . — Arrangement of Valves adopted for Air with a ring of india rubber Pump - a , Gräting . b , India - rubber valve . C C , Guards . recessed into the SCelting ' J D r > , Studs for guards .
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