Straps held the beak in front of the doctor's nose. The mask had glass openings for the eyes and a curved beak shaped like that of a bird. The mask had two small nose holes and was a type of respirator which contained aromatic items. The purpose of the mask was to keep away bad smells, which were thought to be the principal cause of the disease in the miasma theory of infection, before it was disproved by germ theory.
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