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Description: | -50-+50 black scale on white glass panel with the legend "Differential Thermometer". LH.45. (old departmental catalogue number in aluminium paint). NAT. PHIL. LH.45., NP.519. (on white preprinted gummed label, removed) MANU Unsigned. circa 1850 DES after LESLIE,John,Sir,Professor. late 18th century circa 1797 DES after HELMONT,Jan,Baptista,van. circa 1620 Vilvoorden, Brabant, Belgium. This is entirely a demonstration form of Leslie's instrument to allow it to be observed by large numbers of students. The rubber connecting tube allows the instrument, normally filled with dilute sulphuric acid, to be refilled with orther solutions. By detaching one end of the tube also allows the air in the instrument to return to equilibrium more quickly after use.
If the left hand bulb is held in the hand the air in the tube expands and raises the column of liquid in the right hand arm of the instrument. The difference in temperature can then be read from the scale. | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
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