
Claire Tole-Moir
Head of Department
£6,000 - £9,000
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Invented by M. Hervé Mangon, the changes of temperature are derived from the difference in coefficient of expansion between an iron and a zinc rod of 1 meter and registered on a paper placed on a rotating cylinder. The accuracy of it's measurement was revolutionary for the time. There were very few thermographs constructed, a similar one is currently exhibited in the 'Arts et Métier' museum in Paris, this is the second one manufactured. Besides the complicated mechanism it's a highly decorative object.
See: The old French scientific journal, 'La Nature' of the first semester of 1878, page 140 and 141.