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Tellurium. Geographical details on the sphere include loxodromes for 32 compass points. California is still an island and the extension of north-west America is labelled 'TERRA INCOGNITA / sive / TERRA ESONIS'. In Central Asia the Caspian Sea and Lake Aral are depicted. Australia is drawn according to the Dutch discoveries and the discoveries of William Dampier are recorded. A total of nine oceans are named. The tellurium is dated 1805. The representation of the Caspian Sea and Lake Aral…

Tellurium. Geographical details on the sphere include loxodromes for 32 compass points. California is still an island and the extension of north-west America is labelled 'TERRA INCOGNITA / sive / TERRA ESONIS'. In Central Asia the Caspian Sea and Lake Aral are depicted. Australia is drawn according to the Dutch discoveries and the discoveries of William Dampier are recorded. A total of nine oceans are named. The tellurium is dated 1805. The representation of the Caspian Sea and Lake Aral…

Grand Orrery by Benjamin Martin (London 1767); Putnam Gallery at Harvard Science Center; Used by John Winthrop to teach astronomy

Grand Orrery by Benjamin Martin (London 1767); Putnam Gallery at Harvard Science Center; Used by John Winthrop to teach astronomy

The heliostat takes light from the sun as it tracks across the sky, and redirects it in a fixed direction. To accomplish this, the light is reflected from a mirror that reproduces the motion of the sun, except at twice the rate. Although he did not invent the heliostat, the Dutch physicist William Jacob s’Gravesande gave it first prominence through mention in his 1742 textbook. Pictured is a Silbermann-type heliostat made by instrument manufacturer Duboscq.

The heliostat takes light from the sun as it tracks across the sky, and redirects it in a fixed direction. To accomplish this, the light is reflected from a mirror that reproduces the motion of the sun, except at twice the rate. Although he did not invent the heliostat, the Dutch physicist William Jacob s’Gravesande gave it first prominence through mention in his 1742 textbook. Pictured is a Silbermann-type heliostat made by instrument manufacturer Duboscq.

English orrery clock - Rendez vos souvenirs durables avec www.remix-numerisation.fr

English orrery clock - Rendez vos souvenirs durables avec www.remix-numerisation.fr

Google Image Result for http://www.geodus.com/globe-map/tresgrand/am_GL039.jpg

Google Image Result for http://www.geodus.com/globe-map/tresgrand/am_GL039.jpg

TELLURIUM. French, late 19th century, height 17", width 18".  Signed: INSTRUMENT ASTRONOMIQUE M.VIVIEN DE ST MARTIN PAR AMBASSADE DE FRANCE DANS LE EMPIRE AUTRICHE-HONGARIE 1889. 17,000pounds.  driven by clockwork, devised to demonstrate the effect of the motion of the earth and the obliquity of its axis in causing the alternation of day and night, and the succession of the seasons. to teach "the use of the globes", as elementary astronomy was called.

TELLURIUM. French, late 19th century, height 17", width 18". Signed: INSTRUMENT ASTRONOMIQUE M.VIVIEN DE ST MARTIN PAR AMBASSADE DE FRANCE DANS LE EMPIRE AUTRICHE-HONGARIE 1889. 17,000pounds. driven by clockwork, devised to demonstrate the effect of the motion of the earth and the obliquity of its axis in causing the alternation of day and night, and the succession of the seasons. to teach "the use of the globes", as elementary astronomy was called.

Photo of a globe taken at the British Museum on September 19, 2010, London, England, GB.

Photo of a globe taken at the British Museum on September 19, 2010, London, England, GB.

SPHERE ARMILLAIRE, copernicenne, modèle indo-persan, 19ème, constituée

SPHERE ARMILLAIRE, copernicenne, modèle indo-persan, 19ème, constituée