40-foot telescope
William Herschel's 40-foot telescope, also known as the Great Forty-Foot telescope, was a reflecting telescope constructed between 1785 and 1789 at Observatory House in Slough, England. It used a 48-inch (120 cm) diameter primary mirror with a 40-foot-long (12 m) focal length (hence its name "Forty-Foot"). It was the largest telescope in the world for 50 years. It may have been used to discover Enceladus and Mimas, the 6th and 7th moons of Saturn. It was dismantled in 1840 by Herschel's son John Herschel due to safety concerns; today the original mirror and a 10-foot (3.0 m) section of the tube remain.
1787 in Great Britain1787 in science40-ft telescope40 foot telescopeEnceladusGeorge_IIIGold Medal of the Royal Astronomical SocietyGreat Forty-FootGreat Forty-Foot telescopeHistory of the telescopeList of large optical telescopesList of largest optical telescopes historicallyList of largest optical telescopes in the 18th centuryList of largest optical telescopes in the 19th centuryList of largest optical telescopes in the British IslesMMT ObservatoryMimas (moon)Reflecting telescopeSpeculum metalWilliam HerschelWilliam Herschel's Telescope
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40-foot telescope
William Herschel's 40-foot telescope, also known as the Great Forty-Foot telescope, was a reflecting telescope constructed between 1785 and 1789 at Observatory House in Slough, England. It used a 48-inch (120 cm) diameter primary mirror with a 40-foot-long (12 m) focal length (hence its name "Forty-Foot"). It was the largest telescope in the world for 50 years. It may have been used to discover Enceladus and Mimas, the 6th and 7th moons of Saturn. It was dismantled in 1840 by Herschel's son John Herschel due to safety concerns; today the original mirror and a 10-foot (3.0 m) section of the tube remain.
has abstract
El telescopi de 40 peus (12 me ...... etres tub encara es conserven.
@ca
El telescopio de 40 pies de Wi ...... n del tubo de 3 m de longitud.
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La Casa Osservatorio (in ingle ...... o stemma araldico di Herschel.
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Le télescope de 40 pieds de Wi ...... grandes icônes de l'astronomie
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William Herschel's 40-foot tel ...... m) section of the tube remain.
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مقراب الأربعون قدمًا ويُعرف أي ...... وقع الذي تم بناء المقراب فيه .
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ウィリアム・ハーシェルの40フィート望遠鏡は、イングランドの ...... 体され、主鏡と鏡筒の一部（長さ約3メートル）のみが現存する。
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El telescopi de 40 peus (12 me ...... etres tub encara es conserven.
@ca
El telescopio de 40 pies de Wi ...... su nombre de "Cuarenta-Pies").
@es
La Casa Osservatorio (in ingle ...... o stemma araldico di Herschel.
@it
Le télescope de 40 pieds de Wi ...... r le Léviathan de Parsonstown.
@fr
William Herschel's 40-foot tel ...... m) section of the tube remain.
@en
مقراب الأربعون قدمًا ويُعرف أي ...... المرآة التي كانت حوالي 2 بوصة.
@ar
ウィリアム・ハーシェルの40フィート望遠鏡は、イングランドの ...... 体され、主鏡と鏡筒の一部（長さ約3メートル）のみが現存する。
@ja
label
40-foot telescope
@en
40フィート望遠鏡
@ja
Casa Osservatorio
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Telescopi de 40 peus
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Telescopio de 40 pies
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Télescope de 40 pieds
@fr
تلسكوب 40 قدم
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