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In laryngeal work it is almost impossible for an observer, without some means of reflecting the laryngeal image, to see over the operator's shoulder.
This instrument is devised for the purpose of demonstrating the topography, physiology, pathology and medical and surgical treatment of the larynx. It can also be used for demonstrations on the nose and ear.
The principle of the instrument is based on the old fashioned window "busybody" and allows two observers at the same time to see what is being done by the operator in the larynx. The biplane mirror can be lowered or elevated to suit the individual patient, but the general position is not changed. This prevents maladjustment of the mirrors.
The instrument has been thoroughly tested and is efficient. It was made for me my George P. Pilling & Son Company.
Lukens RM. LARYNGEAL DEMONSTRASCOPE. JAMA. 1927;89(25):2113. doi:10.1001/jama.1927.92690250001010a