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Obturator ring
The rotary aircraft engines of World War I (engines where the crankshaft was fixed to the airframe and the cylinders rotated) were notoriously difficult to keep cool when operating, concequently the very thin walled steel cylinders became distorted to an unacceptable level. Obturator rings, made of brass, were fitted in order to overcome this out of roundness in much the same way as a leather washer does in a bicycle pump.
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