Instrument for Determining the Altitude of Stars in Minutes

Our model: Brass, etched, cogwheels and gear−rim of steel, diameter: 170 mm. Gear drive with 5 cogwheels and 2 balance cogwheels, transmission ratio 1 : 60. Zainaddīn ‘Umar b. Sahlān as-Sāwī, ( first half of the 5th/11th century) bequeathed to us treatise on an instrument with which the altitudes of stars can be found correct […]

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Mercury Clock

Our model: Wooden case. Measurements: 22 x 30 x 55 cm. Clock face of brass, engraved. Wooden wheel with compartments of plexiglass. Diameter: 25 cm. Constructed by Eduard Farré (Barcelona) The mechanism of this clock consists of a wheel which completes only one rotation in 24 hours. The propelling force is a weight; the escapement […]

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Taqīyaddīn’s Clock with Spring Tension and Striking Mechanism

Our model: Brass, steel, wire ropes. Spring mechanism with key. Height 50 cm. In the second part of his book Taqīyaddīn describes a clock with spring tension, striking mechanism and indicators for the phases of the moon, the days of the week, hours and degrees. The indicators for the days of the week and the […]

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Astrolabe II

Our model: Brass, engraved. 12−cornered mater with bracket and suspension ring, diameter 210 mm. 3 discs for the latitudes 39°/42°, 45°/48° and 51°/54°. Rete with 30 star positions. Double pointer with sights, length 210 mm. On the back a horizontal bar with a cursor and brachiolus. Made by Martin Brunold (Abtwil, Switzerland). Made on the […]

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Astrolabe

Our model: Brass, engraved. Mater with bracket and suspension ring, diameter 150 mm. 3 discs for the latitudes 21°/24°; 27°/33°; 30°/31°. Rete with 29 star pointers, diameter 120 mm. The back carries a double pointer with sights, length 140 mm. Based on an Arabic model, probably dating back to the 7th/13th century. The original is […]

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Zodiacal Armillary Sphere

Our model: Scale 1:4. Diameter 50 cm. Brass, engraved. All rings have divisions in degrees engraved on both sides. Tycho Brahe’s armillary sphere which, must already have been constructed before 1570, is, in comparison with those of Ptolemy and of the observatories of Maragha and Istanbul, the most simple of its kind and at the […]

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The “ruby−casket”

Our model: Brass, etched. 12 x 12 x 2, 5 cm. Disc with gnomon adjustable to different latitudes. It was constructed by the famous astronomer ʿAlī b. İbrāhīm İbn eş-Şāṭir (d. ca. 777/1375) in 767/1366 for one of the Mameluk governors in Damascus. It contains two sundials, a polar one and an equatorial one.

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Ottoman Compass

Our Model: Hardwood case: 25 × 25 × 15 cm. “Cardanic” suspension on a brass ring. To the first Müteferriqa (1145/1732) edition of the Ottoman−Turkish book Cihānnumā by Ḥāccī Ḫalīfe (1609−1658) was added the picture of a compass in which the magnetic needle.

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Taqīyaddīn’s Weight Driven Clock

Our model: Brass, copper, strass stones. Height: 25 cm. The simplest among the weight driven clocks (bingāmāt siryāḳiyye) described by Taḳiyyeddīn in his book on clocks of 966/1559 contains a clockwork whose speed is regulated by a crown escapement.

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