[Tamaya Sextant with Coutinho-style Artificial Horizon].
- [Japan] : Tamaya, approximately 1941.
- Physical description
- 1 sextant
At the library
David Rumsey Map Center
All items must be viewed on site
Request items by Noon (12p) the day before your visit to allow for retrieval by staff. You can request at most 5 items per day.
|GA51.B9 T3 1941 HORIZON||In process|
- Publication date
- Serial number 564 circa 1941 in oak box with accessories.
- Collector's note: Extremely scarce ... Unique feature is the Coutinho-style artificial horizon, invented by Portuguese Admiral Coutinho in the 1920s for aerial use on dirigibles/zeppelins and originally manufactured by C. Plath. Coutinho Artificial Horizons are extraordinarily rare, as they were quickly replaced by the style of bubble horizon. The AH on this sextant appears identical to the Plath design, so it was definitely licensed and perhaps even OEM'd from Plath ... The Coutinho AH was obsolete for aeronautical use by the mid-1930s, so it was [likely] used on a navy ship ... An AH sextant would be useful whenever the horizon was obscured (e.g. by darkness or weather), but it would also have been especially useful on a submarine owing to the low freeboard and low elevation of the conning tower above the water making horizon shots impossible much of the time … [This sextant] has several scopes, each more specialized than the last, including a very obscure Galilean scope.
Browse related items
Start at call number: