Hauptner mouth gag

Hauptner mouth gag

a speculum for opening the mouth of horses or cows. Consists of two dental plates into which the incisors fit (the dental pad in the upper jaw of the cow). The bottom plate is fixed, the top plate can be moved away from the bottom one, thus opening the mouth, by twisting a screw-threaded handle which passes through a metal arch that goes over the nose and is fixed to the bottom plate.