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A 19th-Century French lacquered-brass magnetometer used to measure the strength and, in some cases, the direction of magnetic fields.

A 19th-Century French lacquered-brass magnetometer used to measure the strength and, in some cases, the direction of magnetic fields.

A theodolite is a precision instrument for measuring angles in the horizontal and vertical planes. Theodolites are used mainly for surveying applications, and have been adapted for specialized purposes in fields like metrology and rocket launch technology.:

A theodolite is a precision instrument for measuring angles in the horizontal and vertical planes. Theodolites are used mainly for surveying applications, and have been adapted for specialized purposes in fields like metrology and rocket launch technology.:

This apparatus is listed in the 1885 catalogue of Jules Duboscq of Paris as the “Grand Circle of MM. Jamin et Sénnarmont.” It was designed for the study of the laws of polarized light reflected from crystalline substances, liquids and metals. It could also be used to measure indices of refraction. With its accessories, it cost 1,000 francs (about $200). The circle is an early example of an ellipsometer, used to study the reflection of light at or near Brewster's angle.

This apparatus is listed in the 1885 catalogue of Jules Duboscq of Paris as the “Grand Circle of MM. Jamin et Sénnarmont.” It was designed for the study of the laws of polarized light reflected from crystalline substances, liquids and metals. It could also be used to measure indices of refraction. With its accessories, it cost 1,000 francs (about $200). The circle is an early example of an ellipsometer, used to study the reflection of light at or near Brewster's angle.

A  fine kaleidoscope  (mahogany,brass and  ivory) English school,19th century

A fine kaleidoscope (mahogany,brass and ivory) English school,19th century

Selenographia Moon Globe, by John Russell, London, 1797.    ©Museum of the History of Science, Oxford

Selenographia Moon Globe, by John Russell, London, 1797. ©Museum of the History of Science, Oxford

A Large Antique brass solar microscope compendium by William Harris & Co, London. circa 1816. For sale at http://www.fleaglass.com/ads/a-solar-microscope-compendium-by-wm-harris-7-co-london/

A Large Antique brass solar microscope compendium by William Harris & Co, London. circa 1816. For sale at http://www.fleaglass.com/ads/a-solar-microscope-compendium-by-wm-harris-7-co-london/

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