You searched for: “pneumatoscopes
pneumatoscope (s) (noun), pneumatoscopes (pl)
1. An outdated term for an instrument for measuring the extent of the respiratory excursions of the chest: Dr. Smart used a pneumatoscope to assess the movements in Jack's chest in order to detect any possible disorders.
2. A noncurrent expression for the tool used in auscultatory percussion: A pneumatoscope is used to listen to the sounds of the chest or of other internal organs.