Stock Photo - Engraving depicting James Dewar's vacuum flasks - (top) old flasks for manipulating liquid gases - (bottom) his new vacuum flasks. Sir James Dewar (1842-1923) a Scottish chemist and physicist. Dated 20th Century

Stock Photo: Engraving depicting James Dewar's vacuum flasks - (top) old flasks for manipulating liquid gases - (bottom) his new vacuum flasks.

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