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Jacobus Barnaart (6 October 1726 in Haarlem - 2 November 1780 in Haarlem) was a Dutch merchant and one of the five first directors of the Teylers Stichting. Barnaart, son of and Margaretha van Elten, was born in a relatively rich Baptist family. His father was a merchant, silk cloth manufacturer, and regent of the local orphanage. He could afford to send his son to the Latin school (1738) and the Academy (1744). Following in the footsteps of his father, the younger Barnaart became a merchant, but also showed an interest in astronomical measurements. In 1756 he was appointed as future director of the Teylers Stichting, which was finally founded at the death of Pieter Teyler van der Hulst in 1778. After founding the Stichting (Foundation) he became one of the five directors responsible for

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  • Jacobus Barnaart (Haarlem, 6 d'octubre de 1726 – 2 de novembre de 1780) fou un comerciant neerlandès i un dels cinc primers directors del Fundació Teyler (en neerlandès, Teylers Stichting). Jacobus Barnaart, fill de Jacobus Barnaart i Margaretha van Elten, nasqué al si d'una família baptista relativament rica. El seu pare era comerciant, fabricant de roba de seda i regent de l'orfenat baptista local; es podia permetre enviar el seu fill a l' (1738) i a l'Acadèmia (1744). Seguint els passos del seu pare, el fill Barnaart també es convertí en comerciant, però també va mostrar un interès en les mesures astronòmiques. El 1756 se'l nomenà futur director de la Fundació Teyler, fundada després de la mort de Pieter Teyler van der Hulst. Després de fundar la Fundació Teyler es convertí un dels cinc directors responsables del Museu Teyler i les societats que sorgiren. Interessat en l'astronomia, Barnaart insistí també a establir un observatori astronòmic sobre la Sala Ovalada del Museu Teyler, tot i que personalitats com Martinus van Marum van expressar que no seria un lloc pràctic degut a les vibracions i a les mesures inexactes que produiria. Finalment, es va construir l'Observatori Astronòmic Teyler sobre la Sala Ovalada, tot i que amb un espai més reduït del que inicialment s'havia planejat. S'han conservat els diaris de Barnaart, els quals descriuen les seves vivències des dels 11 anys i algunes de les seves observacions astronòmiques. (ca)
  • Jacobus Barnaart (6 October 1726 in Haarlem - 2 November 1780 in Haarlem) was a Dutch merchant and one of the five first directors of the Teylers Stichting. Barnaart, son of and Margaretha van Elten, was born in a relatively rich Baptist family. His father was a merchant, silk cloth manufacturer, and regent of the local orphanage. He could afford to send his son to the Latin school (1738) and the Academy (1744). Following in the footsteps of his father, the younger Barnaart became a merchant, but also showed an interest in astronomical measurements. In 1756 he was appointed as future director of the Teylers Stichting, which was finally founded at the death of Pieter Teyler van der Hulst in 1778. After founding the Stichting (Foundation) he became one of the five directors responsible for the Teylers Museum and the Teylers societies. Barnaart's interest in astronomy led to his setting up an astronomical observatory on top of the Oval Room, although he was advised by Martinus van Marum that this would not be a practical place due to vibrations, which could lead to inexact measurements. The Teylers astronomical observatory was constructed on top of the Oval Room, but in a smaller version than initially planned. Diaries of Barnaart have been preserved, describing his experiences from age 11 onward, which includes some of his astronomical observations. (en)
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  • Jacobus Barnaart (Haarlem, 6 d'octubre de 1726 – 2 de novembre de 1780) fou un comerciant neerlandès i un dels cinc primers directors del Fundació Teyler (en neerlandès, Teylers Stichting). Jacobus Barnaart, fill de Jacobus Barnaart i Margaretha van Elten, nasqué al si d'una família baptista relativament rica. El seu pare era comerciant, fabricant de roba de seda i regent de l'orfenat baptista local; es podia permetre enviar el seu fill a l' (1738) i a l'Acadèmia (1744). Seguint els passos del seu pare, el fill Barnaart també es convertí en comerciant, però també va mostrar un interès en les mesures astronòmiques. El 1756 se'l nomenà futur director de la Fundació Teyler, fundada després de la mort de Pieter Teyler van der Hulst. Després de fundar la Fundació Teyler es convertí un dels cinc (ca)
  • Jacobus Barnaart (6 October 1726 in Haarlem - 2 November 1780 in Haarlem) was a Dutch merchant and one of the five first directors of the Teylers Stichting. Barnaart, son of and Margaretha van Elten, was born in a relatively rich Baptist family. His father was a merchant, silk cloth manufacturer, and regent of the local orphanage. He could afford to send his son to the Latin school (1738) and the Academy (1744). Following in the footsteps of his father, the younger Barnaart became a merchant, but also showed an interest in astronomical measurements. In 1756 he was appointed as future director of the Teylers Stichting, which was finally founded at the death of Pieter Teyler van der Hulst in 1778. After founding the Stichting (Foundation) he became one of the five directors responsible for (en)
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  • Jacobus Barnaart (ca)
  • Jacobus Barnaart (en)
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