Anaesthetists of old had to be careful not to asphyxiate their patients by giving them a 100 per cent dose of nitrous oxide, Dr Swiney said.
Another interesting, if not scary, piece of medical equipment held at the museum is an iron lung donated by Viscount Nuffield in the late 1930s.
The iron lung was a cabinet respirator that helped people paralysed by polio to breathe.
"You had this machine doing your breathing, your head was stuck out the top, you couldn't imagine a worse fate," Dr Swiney said. "Everything you did, bowel functions and everything, had to be done by someone working through a rubber sleeve."
The medical museum also sports an original letter by Florence Nightingale, donated by the family of early Whangarei settler AH Reed.
Speaking of nurses, Dr Swiney has photos of all the matrons who ever walked the wards of Whangarei Hospital.
"I think most of the interest [in the museum] lies with the nurses who worked with this stuff. Doctors don't seem terribly interested," he said.
While still settling in and setting up at the heritage park, Dr Swiney hopes the museum will be ready to open to the public within a month or two.