By W.F.J. Mörzer Bruyns, Richard Dunn
A listing of the Mariner's Quadrants, Mariner's Astrolabes Cross-staffs, Backstaffs, Octants, Sextants, Quintants, Reflecting Circles and synthetic Horizons within the nationwide Maritime Museum, Greenwich.
Sextants at Greenwich involves major sections: The introductory chapters and of navigating tools of the nationwide Maritime Museum.
the 1st part provides a basic evaluation of the historical past of celestial navigation with an emphasis at the tools that have been built and used for that function, among approximately 1450 and the Seventies. The tools within the catalogue shape the most thread in those chapters.
includes 347 entries of tools for celestial navigation, the octants, sextants and similar tools preserved within the nationwide Maritime Museum. each one access contains where of the object's beginning, its maker, the object's date, inscriptions (by the maker and/or on the subject of an owner), the graduated scale, the instrument's dimensions and a common description that incorporates information resembling used fabrics and indifferent elements. eventually the object's provenance (previous proprietors and/or clients) and references to literature on its background and dealing with are given.
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Extra resources for Sextants at Greenwich: A Catalogue ...
After returning to the Republic he was appointed professor of mathematics and astronomy at the University of Leiden, and for his lectures used demonstration apparatus that was provided by Musschenbroek. 74 The fact that it was ﬁrst used on a naval vessel was due to the Anglophile Admiral Hendrik Lijnslager, who was a relative of Visscher. The ﬁrst octants for ships of the VOC were purchased from Musschenbroek, in 1741, and three years later four were bought from Benjamin Ayres. In 1747 it was decided that each Company vessel was to be supplied with an octant, together with printed instructions for use, which were written by Cornelis Douwes.
All were from the Strand and Fleet Street in London, or from the shipping area around the Tower of London and in Wapping. 57 Stuck on the inside of one of its struts is a piece of paper containing the handwritten text ‘J Sisson Single No 8. 19–28. 58 ‘Single’ indicates that it was made for fore observation only, and the note suggests George Hadley’s further involvement with the introduction of his brother’s invention. 249 Sept. 22 1744 G. 59 Here the word ‘single’ is omitted because it is ﬁtted for back observation.
Stimson, The Mariner’s Astrolabe, 36–7. Resulting in an accuracy of 15 nautical miles to the north or south of the latitude, at the best. In 1670 the Dutch East India Company valued a mariner’s astrolabe at 13 guilders and a cross-staff at just over 2 guilders; see Schilder and Mörzer Bruyns, ‘Navigatie’, 180. Mörzer Bruyns, The Cross-Staff, 16; Stimson, The Mariner’s Astrolabe, 42. Waters, The Sea- or Mariner’s Astrolabe; Stimson, The Mariner’s Astrolabe. The known number has since increased to about 85 (personal communication from Alan Stimson).
Sextants at Greenwich: A Catalogue ... by W.F.J. Mörzer Bruyns, Richard Dunn