Summarizing the discovered associations using direction setting rules

The invention is concerned with apparatus involving the hydrostatic compression of an elastomer. The apparatus has a first mass of precompressed elastomer in a first enclosure in which a first piston is slidably mounted. The first piston defines a second enclosure for a second mass of precompressed elastomer in which a second piston is slidably mounted. The second mass of elastomer is under a considerably higher pressure than the first mass of elastomer. Apparatus in accordance with the invention can be used in railway couplings.