FTP, name this medical device invented in 1816 by Ren?La?nec, which allows a doctor to listen to the patient's chest.
Oliver Wendell Holmes wrote a ballad about this device, in which a young man is confused by one after some "silly, confused flies" are trapped in a spider's web within it.  It was improved by Pierre Adolphe Piorry, who added a "pleximeter" to it.  Most of the ones in use today follow a design introduced by David Littmann, while George Camman seems to have invented the first usable binaural one in 1852.  The original one was invented after a French scientist saw some children playing with a piece of wood, after which he experimented with paper and wood tubes.  Its use was discussed in the Treatise on Mediate Auscultation by its inventor, who originally called it "The Cylinder" before he gave it a name from the Greek for "I see" and "the chest."  FTP, name this medical device invented in 1816 by Ren?La?nec, which allows a doctor to listen to the patient's chest.
Oliver Wendell Holmes wrote a ballad about this device, in which a young man is confused by one after some "silly, confused flies" are trapped in a spider's web within it.  
the stethoscope