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Wooden stick barometer threaded brass at the edges John Maineri 1820
$3,828.59
£2,858.30
€3,200
CA$5,274.16
A$5,786.76
CHF 3,048.19
MX$68,839.59
NOK 39,046.90
SEK 35,655.15
DKK 24,385.22
About the Item
Ebonized wood cue barometer with brass threading at the edges, signed Giovanni Maineri early 19th cent.
Barometer with ebonized wood reservoir complete with sea bone float indicating the correct mercury level, adjusted by the setting screw below the reservoir.
The barometer is complete with a nonius for reading the change in atmospheric pressure, hygrometer and mercury thermometer.
Good condition, signs of use, measures 8x6x100 cm - inches 3.1x2.4x39.4
To be sure, the barometer is emptied of mercury.
Evangelista Torricelli (1608-1647), mathematician and physicist, a disciple of Galileo, was the first in 1643 to build a measuring instrument capable of detecting changes in pressure Mercury was already known in antiquity to the Chinese and Hindus; it was found in Egyptian tombs dated around 1500 BC. By 500 B.C. its use as an amalgamant for other metals began. The ancient Greeks used it as a pigment for paintings, and the Romans employed it in cosmetics. According to medieval alchemists it was the matter from which everything else was formed, and they thought that once hardened it would turn into gold. In the 18th and 19th centuries, mercury nitrate was used to remove hair from hides used to make hats: this caused many cases of brain damage among those who made these headdresses, even leading to the coining of the saying "mad as a hatter."
Since ancient times man, as a farmer and navigator, has observed and attempted to predict weather patterns. The scientific study of the changes occurring in the atmosphere began in the mid-17th century in connection with experiments tending to prove the existence of a vacuum, which ancient philosophers denied since "nature abhors a vacuum!" If you fill a long tube with water and place it upside down in a bucket with water, the column of liquid will descend until its weight is counterbalanced by air pressure on the surface of the water in the bucket: at some point in the upper, closed end of the tube there will be a vacuum.
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