NOBILI’S-BARLOW   ELECTRIC TERRESTRIAL GLOBE

NOBILI’S-BARLOW ELECTRIC TERRESTRIAL GLOBE

Stock Number: 1

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AN EXTREMELY RARE EARLY ELECTRIC DEVICE !

Dimensions

LARGE 19 CM , HIGH 35 CM

Circa

LATE 1800

Country of manufacture

Other

Categories: Scientific, Technology, Globes & Orreries, Physics & Chemistry, Engineering antiques, Other Technology Antiques

Description

  Model of terrestrial globe, formed by a wooden sphere with copper wire wrapped in a latitude sense. It is supported by a brass pedestal mounted on a wooden base. The globe can be rotated manually and positioned at different angles. When it is connected to a battery by means of the terminals placed on the base, it generates a magnetic field that can be detected by means of a magnetic inclination needle . In this way the globe allows to simulate a miniature Earth with its terrestrial field acting on the compasses.

In the 1600s, William Gilbert had demonstrated the magnetic inclination by means of a “terrella”, that is a spherical magnet. Leopoldo Nobili conceived this electromagnetic model in 1822, while André-Marie Ampère was formulating the relationship between electricity and magnetism. The instrument is commonly known as “Barlow’s globe”, named after Peter Barlow, who, in 1824, had shown his apparatus at the Royal Institution in London.

Signed “Manuelli-Reggio Emilia” ( Italy)

 

very rare item !!

 

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IT AEQUATORIUM

We are located in Northern Italy and we collect and restore for over thirty years antique scientific instruments. In 1996 it began our activities' about trade , buying and selling scientific and technical items and other art antiquities. We specialize in antique teaching , astronomical, and medical instrumets. In our website (under construction) www.aequatorium.com you can have a more comprehensive view of our field of activity '.

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