John Goater: Oktant von Goater (Spiegel-Oktant, 1770) About the Object
  • https://bavarikon.de/object/bav:DMM-DDD-00000B3D00000100
  • Oktant von Goater (Spiegel-Oktant, 1770)
  • Enhanced description
    • John Goater
    • London
  • um 1770
  • 78 x 418 x 488 mm – Masse: 1,41 kg
    • Geodäsie
    • Winkelmessung
    • Messung von Zeit und Raum: Historische Messinstrumente aus dem Deutschen Museum
  • Deutsches Museum
  • Deutsches Museum
    • Deutsches Museum von Meisterwerken der Naturwissenschaft und Technik - Inventory number: 1980-113
  • Licence of the Metadata: CC0
  • Aufschrift: [Oktant:] GOATER at No. 141 / Wapping LONDON | Hersteller Etikett: [Holzkasten:] T. RAYNER , / SHIP CHANDLER , / North End 16 High Street, / (HULL.) / Quadrants & Compasses made clean’d & rep.d | Schiffsausstatter
  • 08.07.2019

Oktant von Goater (Spiegel-Oktant, 1770)

um 1770
  • John Goater
  • London

Description

The octant's frame and alidade are made of rosewood (possibly also mahogany), the inlaid reference circle is made of Indian boxwood. All other parts are made of brass. The reference circle is divided from 0° to 90° in intervals of 20'. It is 900 mm in diameter. Two minutes can be read off directly with the aid of a transverse division. The instrument is set up so that measurements can also be taken with the sun behind you. The three retractable filters can be repositioned for this purpose. The measurement results are noted on the ivory board using the pencil in the centre bar.

CC BY-SA 4.0