Teylers astronomical observatory

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Courtyard of Teylers Foundation House with the observatory on the roof of the Oval Room. Current situation. Courtyard of Teylers Foundation House with the observatory.jpg
Courtyard of Teylers Foundation House with the observatory on the roof of the Oval Room. Current situation.

The Teylers astronomical observatory (Dutch: Teylers Sterrenwacht) is an astronomical observatory built in 1784 on the roof of the Oval Room of the Teylers Museum in Haarlem. [1]

Teylers Museum Art museum, Natural history museum, Science museum in Haarlem, The Netherlands

Teylers Museum is an art, natural history, and science museum in Haarlem, Netherlands. Established in 1778, Teylers Museum was founded as a centre for contemporary art and science. The historic centre of the museum is the neoclassical Oval Room (1784), which was built behind the house of Pieter Teyler van der Hulst (1702–1778), the so-called Fundatiehuis. Pieter Teyler was a wealthy cloth merchant and banker of Scottish descent, who bequeathed his fortune for the advancement of religion, art, and science. He was a Mennonite and follower of the Scottish Enlightenment.

Haarlem City and municipality in North Holland, Netherlands

Haarlem is a city and municipality in the Netherlands. It is the capital of the province of North Holland and is situated at the northern edge of the Randstad, one of the most populated metropolitan areas in Europe. Haarlem had a population of 159,556 in 2017. It is a 15-minute train ride from Amsterdam, and many residents commute to the country's capital for work.

History

Wybrand Hendriks, Inner courtyard of Teylers Foundation House, Haarlem, 1800. Collection Teylers Museum. Hendriks' painting shows that museum visitors used the Observatory to view the panorama of Haarlem and its surroundings. Hendriks ,Courtyard of Teylers Foundation House, c. 1800.jpg
Wybrand Hendriks, Inner courtyard of Teylers Foundation House, Haarlem, 1800. Collection Teylers Museum. Hendriks' painting shows that museum visitors used the Observatory to view the panorama of Haarlem and its surroundings.
Reflecting telescope after Isaac Newton by William Herschel, built to order in 1790 and formerly used in the observatory Reflecting Telescope after Isaac Newton by William Herschel from Slough 1790 - Teylers Oval Room.jpg
Reflecting telescope after Isaac Newton by William Herschel, built to order in 1790 and formerly used in the observatory
Leendert Viervant, Design for an observatory on the roof of the Oval Room of Teylers Museum , drawing, 498 x 374 mm. Viervant, Design for an observatory on the roof of the Oval Room of Teylers Museum.jpg
Leendert Viervant, Design for an observatory on the roof of the Oval Room of Teylers Museum , drawing, 498 × 374 mm.

The observatory was built on the suggestion of Jacobus Barnaart, one of the five initial directors of the Teylers Stichting, which was the foundation responsible for taking care of the inheritance of Pieter Teyler van der Hulst. Barnaart was an amateur scientist who had a great interest in astronomy and wanted to build a state-of-the-art astronomical observatory on the roof of the Oval Room. This proved to be a bad idea, because the roof was made of wood, which transfers too many vibrations to make reliable and precise observations. Hence a belvedère was built instead, a square tower with two doors in each wall. [1]

Teylers Stichting foundation

The Teylers Stichting is a Dutch foundation founded with the heritage of the Dutch 18th century cloth merchant and banker Pieter Teyler van der Hulst to support the people in need and encourage worship, science and art.

Pieter Teyler van der Hulst Mennonite cloth merchant from the Netherlands

Pieter Teyler van der Hulst was a wealthy Dutch Mennonite merchant and banker, who died childless, leaving a legacy of two million florins to the pursuit of religion, arts and science in his hometown, that led to the formation of Teyler's Museum. This was not the value of his entire estate. He also founded Teylers Hofje in his name, and made important donations to individuals in the Mennonite community.

Though the observatory couldn't be used for precision measurements, it was still used for manual observations. The collection of the Teylers physical cabinet contains several telescopes and other devices that were used. Until 1817 the observatory also had a camera obscura, which was used for drawings of the view from the little tower. [2] [3] Though they have not survived, the Teylers archives have evidence that Vincent Jansz van der Vinne was paid 86 guilders for painting the "walls and ceilings of the cupula". [3] That was not the only artwork that early stargazers met with when they climbed the stairs. On the rooftop of the first staircase a vase was installed that was delivered by Jan Woortman in 1781. [3] Though lost since, the vase can be seen in the painting of the courtyard of the Foundation house by Wybrand Hendriks. The vase was the trademark of Teyler, and is visible on the top of Van Marum's electrostatic generator as well.

Teylers Oval Room

The Oval Room in the Teylers Museum was the first part of the museum that was opened in 1784. It could be entered through the garden of the fundatiehuis, the former home of Pieter Teyler van der Hulst. The building has an oval shape built around its centerpiece, a mineralogical cabinet. The Oval Room consists of two floors; the ground floor with its display cabinets and a gallery of books that connects to the Teylers Library. On top of the room, on the roof, the astronomical observatory used to be a landmark that could be seen for miles along the river Spaarne. The gallery and observatory are longer accessible to the public, though the gallery can be seen from the ground floor.

Telescope Optical instrument that makes distant objects appear magnified

Telescopes are optical instruments that make distant objects appear magnified by using an arrangement of lenses or curved mirrors and lenses, or various devices used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. The first known practical telescopes were refracting telescopes invented in the Netherlands at the beginning of the 17th century, by using glass lenses. They found use in both terrestrial applications and astronomy.

Camera obscura optical device that projects an image of its surroundings on a screen

Camera obscura, also referred to as pinhole image, is the natural optical phenomenon that occurs when an image of a scene at the other side of a screen is projected through a small hole in that screen as a reversed and inverted image on a surface opposite to the opening. The surroundings of the projected image have to be relatively dark for the image to be clear, so many historical camera obscura experiments were performed in dark rooms.

The observatory can be reached via a staircase from the Grote Herenkamer (large board room), which is located next to the Oval Room. That staircase leads the visitor to the lower roof, where a steep open air wooden staircase leads to the small room on top of the dome. For precision measurements, a new observatorium was built in the garden, that was later used as a studio by the later curator Jan van Borssum Buisman.

Jan van Borssum Buisman 20th-century painter from the Netherlands

Jan Hendrik van Borssum Buisman, was a 20th-century painter from the Netherlands.

References and Footnotes

  1. 1 2 Teylers Museum Archived 2014-07-18 at the Wayback Machine . about the observatory. (Dutch)
  2. photo of the removal of the staircase in the process or renovation
  3. 1 2 3 Teyler 1778-1978. Studies en bijdragen over Teylers Stichting naar aanleiding van het tweede eeuwfeest (Haarlem / Antwerpen 1978), p 189

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