Electric thermometer, after Snow Harris and Riess

pre 1882

An electric current in a wire will always generate heat. In this instrument that heat is transferred to the air in a glass bulb. The air will expand, which is possible only at the bottom side, where a narrow, downwards sloping tube leads to a reservoir filled with mercury. As the air in the bulb gets warmer, the mercury level in the tube will descend. The height can be read on a scale in tenths of a French inch. By making the slope of the tube less steep, the descend of the mercury level can be better observed. This apparatus is an adaptation by Peter Theophil Riess (1804-1883) of the thermometer of Snow Harris (see cat. no. 731 / FK 560).

Administration name

Fysisch Kabinet

Title

Electric thermometer, after Snow Harris and Riess

Translated title

Electric thermometer, after Snow Harris and Riess

Dating

[{'start': '1882', 'end_precision': u'', 'end': u'', 'start_precision': 'pre'}]

Material

[{'material': 'Mahogany'}, {'material': 'Glass'}, {'material': 'brass'}]

Measurements

[{'notes': u'', 'part': 'geheel', 'type': 'hoogte', 'value': '76', 'unit': 'mm'}, {'notes': u'', 'part': 'plank', 'type': 'lengte', 'value': '470', 'unit': 'mm'}, {'notes': u'', 'part': 'bol', 'type': 'diameter', 'value': '99', 'unit': 'mm'}]

Object number

FK 0562

Reproduction reference

[{'reference': '..\\images\\Fysisch\\Gekoppelde afbeeldingen\\FK 0562.jpg'}]