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Ether was first used for anesthesia during surgery at the MGH in 1846.The dome shaped and glass ceiling of the surgical theater not only enabled surgeons to operate with natural daylight but also to remain awake while performing surgery on their sleeping patients as the fumes from ether rose to the top of the domed amphitheater.The portrait was displayed in the President's Gallery at the New York Academy of Medicine.

He also had a model of a soft metal, multiple-tubed stethoscope made by H. Williams claims to have made a binaural stethoscope with lead tubes in 1843.

This portrait was given to the New York Academy of Medicine by the family for the opening of their new library in 1879 and was thereafter displayed in the Academy's Museum Room. Cammann, a salt print imperial photograph by the renown Mathew B. Note that in this photo the table has a few unidentified books and does not show Dr. The oil portrait is likely a posthumous painting based on the Brady photograph (Dr. Note the velvet sleeves covering the very short tubes. 1863." (Nothern Dispensary minutes courtesy of the New York University Archives, Northern Dispensary photo by Jefferson Siegel and stained glass window photo courtesy of St. Cammann models were designed with different types of tension mechanisms in order to hold the binaural ear pieces together so they would be firm against the auscultator's ears. Cammann was an elastic band stretched between the two ear pieces. Next is Cammann stethoscope with spring tension mechanism, circa 1880 and a Cammann stethoscope with Ford's patented wire spring tension mechanism to hold ear peices together, Hazard, Harzard & Co, circa 1890. John Hatton (1838-1898) who graduated the Iowa University Medical College in 1870 and practiced in Des Moines.

Cammann died in 1863), comissioned by the family to now document the stethoscope he invented in 1852. The metal ear tubes are made of German silver, large and flaring chestpiece was turned from ebony wood, and the earpieces are ivory. The markings on the models shown below help date these stethoscopes and are consistent with the introduction of the Cammann stethoscope in 1852. Cammann developed the binaural stethoscope in 1852 while working at the Northern Dispensary. Below are various examples of the tension mechanism. On the far right is a Cammann stethoscope with screw tension mechanism, Sharp & Smith, circa 1880. Cammann Stethoscope with simple bell made of hard rubber in its original cardboard box, circa 1895.

The stethoscope was named Cammann's Stethoscope by the manufacturer of the original instrument, George Tiemann.

Cammann's model was made with ivory earpieces connected to metal tubes of German silver that were held together by a simple hinge joint, and tension was applied by way of an elastic band.

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This stethoscope and the one above are the only two hand engraved Cammann stethoscopes known to exist. Note that the wood bell does not have as large a flare and the velvet covered tubes are a little longer. in New York City, circa 1860, which appears to have been taken at the same sitting as the salt print photo mentioned above. The three sided building occupies the triangle formed by those streets. During the later half of the 19th century, well educated physicians used advances in medical technology to aid their ability to diagnose diseases in their patients.