The vacuum flask really consists of two bottles, one inside the other, the air being extracted from the space between, forming a vacuum, which is a non-conductor of heat. The temperature in the corked up inner bottle this remains the same, whatever the temperature outside may be, keeping the contents hot or cold as desired. The outer case is simply for protection against breakage.1915/USA
The source of these posters is an archive of 15,000 vintage images along with the historical information on each. All files are stored digitally and are ready for reproduction in a variety of sizes and the quality is closely monitored to ensure satisfactory results.
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