Year: 2009 Language: english Author: Willem Mörzer Bruyns Genre: Catalogue Publisher: Oxford University Press ISBN: 978–0–19–953254–4 Format: PDF Quality: eBook Pages count: 353 Description: The National Maritime Museum at Greenwich is a relevant exception in science museums. From the beginning was established a dedicated Department of Navigation, to which Astronomy was added in 1960. Since that year the Museum has played a leading role in the field, providing expert knowledge through exhibitions, symposiums, catalogues, and other publications. Sextants at Greenwich deals with a purely navigational part of the collection. The first chapter introduces the history of celestial navigation since the beginning of European expansion in the fifteenth century, when the earliest instruments for altitude measurement were developed: the mariner’s quadrant, the mariner’s astrolabe, the cross-staff, the backstaff or Davis quadrant, and finally the octant, invented in 1731. Hadley’s quadrant, now better known as the octant, was the first significant improvement in navigational instruments after the Longitude Act of 1714, and the principle of Hadley’s catoptrics remained in use at sea for the following 250 years. Chapters include the reflecting circle, the quintant, and various artificial horizons. Second part of the catalogue shows beautiful photographs of the instrument collection, along with a brief description, origin of the instrument, maker, precision, dimension, notes, and useful technical information.
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Sextants At Greenwich A Catalogue
Language: english
Author: Willem Mörzer Bruyns
Genre: Catalogue
Publisher: Oxford University Press
ISBN: 978–0–19–953254–4
Format: PDF
Quality: eBook
Pages count: 353
Description: The National Maritime Museum at Greenwich is a relevant exception in science museums. From the beginning was established a dedicated Department of Navigation, to which Astronomy was added in 1960. Since that year the Museum has played a leading role in the field, providing expert knowledge through exhibitions, symposiums, catalogues, and other publications. Sextants at Greenwich deals with a purely navigational part of the collection. The first chapter introduces the history of celestial navigation since the beginning of European expansion in the fifteenth century, when the earliest instruments for altitude measurement were developed: the mariner’s quadrant, the mariner’s astrolabe, the cross-staff, the backstaff or Davis quadrant, and finally the octant, invented in 1731. Hadley’s quadrant, now better known as the octant, was the first significant improvement in navigational instruments after the Longitude Act of 1714, and the principle of Hadley’s catoptrics remained in use at sea for the following 250 years. Chapters include the reflecting circle, the quintant, and various artificial horizons. Second part of the catalogue shows beautiful photographs of the instrument collection, along with a brief description, origin of the instrument, maker, precision, dimension, notes, and useful technical information.
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