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Lot Essay
Druyf was active in Leiden where he was recorded as a member of the Guild of Saint Luke in 1648. Among very few works known by this rare artist is a small painting of a man in the Rijksmuseum, Amsterdam. No other drawings by Druyf seem to be known.
Joos Crommelin(g) was a well-known tradesman in Haarlem, who, according to the inscription on the attached sheet, studied mathematics. As a student at Leiden University he was taught by magister in de mathematische en astronomische kunst', Samuel Kechel (Kechelius).
Kechelius originated from Prague, and is known to have studied in Leiden by 1632. He lived at Rapenburg 28f in Leiden from 1645 onwards. As a master in mathematics and astronomy he was in contact with other scientists of his time, including Christiaan Huygens and the Arabist and astronomer Jacob Golius (1596-1667). Before 1657 he also met the French astronomer Ismael Bouillau, who played a key role in the development of astronomy at the time.
Kechelius further became friends with his fellow student Georg Markgraf, who was among the group of scientists travelling to Brazil with Prince Johan Maurits of Nassau-Siegen in 1636.
Joos Crommelin(g) was a well-known tradesman in Haarlem, who, according to the inscription on the attached sheet, studied mathematics. As a student at Leiden University he was taught by magister in de mathematische en astronomische kunst', Samuel Kechel (Kechelius).
Kechelius originated from Prague, and is known to have studied in Leiden by 1632. He lived at Rapenburg 28f in Leiden from 1645 onwards. As a master in mathematics and astronomy he was in contact with other scientists of his time, including Christiaan Huygens and the Arabist and astronomer Jacob Golius (1596-1667). Before 1657 he also met the French astronomer Ismael Bouillau, who played a key role in the development of astronomy at the time.
Kechelius further became friends with his fellow student Georg Markgraf, who was among the group of scientists travelling to Brazil with Prince Johan Maurits of Nassau-Siegen in 1636.