A Thermos bottle is the principle of the Mercer Vacuum Electric Cylinder. It means hot water being drawn off always at maximum temperature as it does not mix with the surrounding cold water in the cylinder. A Mercer means hot water without the necessity of a fire. Demonstrations at J. Mercer and Sons, 54, Oxford Terrace, near Montreal Street Bridge. QISS
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Star (Christchurch), Issue 18013, 25 November 1926, Page 12
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61Untitled Star (Christchurch), Issue 18013, 25 November 1926, Page 12
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