19th Century Antique English Georg III Mahogany Barometer
£1,542 per item
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Item details
Height
91.0 cm
Width
26.0 cm
Depth
5.5 cm
Wear conditions
Good
Wear conditions
Excellent
Shows little to no signs of wear and tear.
Good
May show slight traces of use in keeping with age. Most vintage and antique items fit into this condition.
Average
Likely to show signs of some light scratching and ageing but still remains in a fair condition.
Apparent Wear and Tear
Visible signs of previous use including scratches, chips or stains.
Please refer to condition report, images or make a seller enquiry for additional information.
Description
A fine quality example of a mercury wheel barometer. A mahogany case. A wider and deeper case with an opening door for the long scale thermometer with silvered dial.
A silvered engraved dial signed 'J.B.Sala, Holborn'. Circa 1820.
The banjo barometer is also known as the wheel barometer. It was invented by Robert Hooke in 1663. He notes that the barometer may forecast and forewarns on the weather thereby preventing many dangers, and the good of mankind thereby promoted. He notes that he states that he founds most certain in predicting rainy and cloudy weather when it falls low, and clear weather when it rises high.
Furthermore, unlike its predecessor the Torricellian tube, the banjo is a siphon barometer in which the tube takes is in the form of a U. If the two mercury surfaces are equal in the area in such a barometer, a given change in height of the mercury column will be divided equally between the two ends, so that the movement of either surface will be about half as much of the mercury in the Torricellian tube. To magnify the motion of the mercury, the barometer has a large bulb on the upper surface hence concentrating motion in the lower exposed arm. A float resting on the exposed mercury surface in the open arm and a line from it passed over the pulley and ended in a counterweight. The pointer on the shaft of the pulley moves over a scale greatly magnifying the mercury motion and consequently better readouts.
Condition report:
Good
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Free collection available
Yes
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- Ships from VALENZA, Italy
Cancellations and Returns
Last updated: 24th March 2025
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