Dewar was interested in cryogenics ... Eventually he designed a double-walled glass flask and removed the air from the space between the two walls, creating a vacuum. Liquid put inside the ...

An Oxford University scientist named Sir James Dewar invented it in 1892, one glass bottle inside another glass bottle with ...

The vacuum flask used by Dewar to preserve very cold liquids at ... under modern mass-production methods, the glass flask is now obtainable at a remarkably low price. The metal vacuum vessel ...