Dutch Telescope

Japanese: オランダ望遠鏡 - おらんだぼうえんきょう
Dutch Telescope


[Inventions and Developments]
The telescope was invented in the Netherlands in 1608, and after hearing this story, G. Galilei built his own in 1609, using it to observe celestial bodies and making various discoveries. The telescope he built combined a convex lens and a concave lens, and was called the Galilean telescope (or Dutch telescope). It produced an erect image, but because of its narrow field of view, it is now only used for opera glasses. A combination of two convex lenses is called a Kepler telescope, and was announced by J. Kepler in 1611.

From [Telescope]

…Galileo, hearing of the success of the Dutch telescope, carried out theoretical analysis and built a prototype telescope the following year. Telescopes from Lippershey to Galileo combined a convex objective lens and a concave eyepiece lens, and are called Dutch telescopes or Galilei telescopes. Although the image is erect, it has the disadvantage of a narrow field of view, and is currently only used in opera glasses. …

*Some of the terminology that refers to the "Dutch Telescope" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:


[発明と発達]
 望遠鏡は1608年にオランダで発明されたが,09年にはG.ガリレイがこの話を聞いて自作し,天体観察に利用して種々の発見をした。彼の作った望遠鏡は凸レンズと凹レンズとを組み合わせたもので,ガリレイ望遠鏡(またはオランダ望遠鏡)と呼ばれ正立像ではあるが,狭視野のため現在ではオペラグラスくらいにしか使われない。2枚の凸レンズを組み合わせたものをケプラー望遠鏡と呼び,J.ケプラーが11年に発表したものである。…

【望遠鏡】より

…このオランダにおける望遠鏡の成功を聞いたガリレイは翌09年,理論的解析を行い,みずから望遠鏡を試作した。リッペルスハイからガリレイに至る望遠鏡は,凸の対物レンズと凹の接眼レンズの組合せであり,オランダ望遠鏡あるいはガリレイ望遠鏡と呼ばれている。像は正立するが視野の狭い欠点があり,現在ではオペラグラスに用いられる程度である。…

※「オランダ望遠鏡」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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