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Eastman Kodak Scales

Eastman Kodak Scales

Raingo orrery clock, French, 1830-1832.

Raingo orrery clock, French, 1830-1832.

Balance

Balance

Orrery

Orrery

An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (in the celestial sphere), consisting of a spherical framework of rings, centred on Earth, that represent lines of celestial longitude and latitude and other astronomically important features such as the ecliptic. As such, it differs from a celestial globe, which is a smooth sphere whose principal purpose is to map the constellations.

An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (in the celestial sphere), consisting of a spherical framework of rings, centred on Earth, that represent lines of celestial longitude and latitude and other astronomically important features such as the ecliptic. As such, it differs from a celestial globe, which is a smooth sphere whose principal purpose is to map the constellations.

Outstandind Orrary by EV miniatures

Outstandind Orrary by EV miniatures

Altitude & Azimuth Instrument - Troughton & Simms, London, 18 Inch, circa 1836. Used for the geodetic survey of Victoria [1858-71] and during observation of the transit of Venus by EJ White in 1874.

Altitude & Azimuth Instrument - Troughton & Simms, London, 18 Inch, circa 1836. Used for the geodetic survey of Victoria [1858-71] and during observation of the transit of Venus by EJ White in 1874.

Prisms have been standard laboratory equipment since Isaac Newton used one in 1666 to study the nature of the spectrum. The three prisms hanging from the brass stand may be folded up in pairs to demonstrate achromatism (no color separation) or constant deviation (no color dependence of the angle of minimum bending of light). These were made by Lerebours et Secretan of Paris, and are listed at 50 francs in the 1853 catalogue.

Prisms have been standard laboratory equipment since Isaac Newton used one in 1666 to study the nature of the spectrum. The three prisms hanging from the brass stand may be folded up in pairs to demonstrate achromatism (no color separation) or constant deviation (no color dependence of the angle of minimum bending of light). These were made by Lerebours et Secretan of Paris, and are listed at 50 francs in the 1853 catalogue.

Miniature Orrery on Stand by artisan Mike Barbour

Miniature Orrery on Stand by artisan Mike Barbour

A Rare Pair of George III Telescopic Reading Tables Attributed to Gillows

A Rare Pair of George III Telescopic Reading Tables Attributed to Gillows

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