WMD is still under construction. This site will include medical equipment that is considered historical, the weird, and medical quackery. An up to date links that include sites that include, or focus on WMDs. I would also like to complile a list of brick and mortar museums that are dedicated to WMDs.
This is a photo of Laurel and Hardy in the movie, Saps at Sea. Oliver is getting a make shift pulmonary function from Stanley with a balloon. Note the close-up markings on the right. It looks like it is in increments of 10 something or other.
 
 
This is an early oxygen cannula that was probably in use in the forties. The headstrap is canvas and the tubing is made out of metal. Looks like it would not be comfortable at all. The cannula was discovered in a hospital "attic" in St. Louis, MO.