swan neck flask
gooseneck flask

Like a beagle to its rabbit Pasteur was drawn to this oven with its swan neck flasks.

A little later at a brilliant meeting where the brains and wit and art of Paris fought to get in, Pasteur told of his swan neck flask experiment in rapturous words.

Then he took ten of his swan neck flasks and ingeniously sealed straight tubes of glass into their sides, and through these straight tubes in each one he put a drop of this wash water from the ripe grapes.