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Description: | Ebony frame with ivory scale having anchor engraved at its centre, calibrated in degrees, micrometer adjustment & Vernier to 1' arc. 1 green shade, 2 red shades. Double pin-hole site with moveable cover across a single pin-hole. Forerunner of the sextant, the OCTANT is similarly used as a navigational aid to measure angles from which the position of the observer can be deduced. The measurement most commonly taken is the altitude of the sun at noon. This particular octant is likely to be the one recorded as purchased in 1803 for £3.10.0 . In those days new models were not produced with the same frequency as they are nowadays. | License: | http://www.abdn.ac.uk/historic/Copyright_terms_conditions.shtml | Publisher: | ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments | Rights holder: | 47718 | Temporal: | 1803 | Source: | University of Aberdeen | Creator: | unknown ( Jas Matthews supplier / see JSR M.Litt. thesis ) | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
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