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Description: | L.H.21.(old departmental catalogue number in aluminium paint). Nat. Phil. LH 21 NP 494 (on preprinted gummed label, removed). DES HOPE,Thomas,Charles,Professor. pre January 1804 Edinburgh, Scotland. PUB HOPE,Thomas,Charles,Professor. 1805 Edinburgh Scotland MANU Unsigned. after 1805 This is a very early example of Hope's apparatus, the central glass cylinder is 100mm in diameter it has a lip formed by pressing the end of the glass whilst still molten the purpose of which was presumably to hold the twine used to suspend the two thermometers one at the top of the vessel and the other at the bottom. there is a second lip formed in the same manner 160mm from the base of the vessel which holds the ice trough or gutter which is 172mm in diameter and 83mm deep and completely surround the cylider. This trough is seperate from the main cylinder and the gap between the two is sealed with the wax. The cylinder appears to be made of two sections again sealed with wax. This instrument does not have the drainage tubes, or thermometer ports, that later versions have. This instrument is of hand blown glass and the pintel has been ground off and polished.
The bulb of a thermometer T1 is positioned at the top of the cylinder another T2 at the bottom and the cylinder is filled with water. The trough is filled with ice. The tenperature at T2 is observed to fall first and as all of the water cools then both thermomters T1 and T2 are observed to read the same temperature (3.98 degrees Celcius) as cooloing continues the bottom thermometer T2 remains at this temperature. The temperature of the water at T1 however is observed to decrease towards zero. Thus proving that water below 3.98 degrees is less dense than water at 3.98 degrees.
On loan to the Physics and Astronomy Department EXIT NUMBER 2092 it is object 23 in display case A Kelvin & 'the New Professors ', in room 470, The Kelvin Building, Department of Physics and Astronomy Glasgow University. | 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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