Compressor, Guyon, steel and brass, chromium-plated and gilt, by Collin of Paris, from Charriere, Collin and Gentile collection, circa 1870

The compressor is used during an embryotomy. This procedure involves the destruction of the foetus when natural childbirth is impossible. It was developed by French obstetrician Jean Casimir Félix Guyon (1831-1920). The chain was passed by the flexible guide around the head of the foetus. It was then tightened by a ratchet mechanism.

The compressor is made of steel and brass. It was made by Collin of Paris. It was originally part of an instrument collection belonging to amalgamated French companies Charrière, Collin and Gentile. The compressor was sold in 1978.